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Robstar is the het ship between Robin and Starfire from the Teen Titans fandom.

Robin and Starfire always seemed to have connection through the series, but didn't get together until the movie Trouble in Tokyo. Starfire's bubbly, sweet innocence balances with Robin's serious, down to earth vibe.

Canon
They are each other's best friend and main love interest throughout the series. Ever since the day the two of them first met, both Robin and Starfire have had romantic feelings for each other, but are completely unaware of how the other feels. However, though they remain unaware, it's obvious to everyone else how they truly feel about each other, as even a few enemies have realized just how smitten they are.

Though Robin and Starfire try to hide their feelings, they are shown to have jealous moments; Starfire is very pretty and boys often flirt with her, which infuriates Robin to no end. Starfire also becomes extremely jealous when girls flirt with Robin, as shown when she was distraught when he spends so much time with her sister, Blackfire, or when he took Kitten to her prom. It is also seen throughout the series that they are at each other's side.

Since Starfire is still new to Earth and its customs, Robin takes the time to help her learn to adjust to life on Earth which also strengths their bond with each other. On occasion this had led to dates (or date-like events). Starfire enjoys Robin's teachings to no end and they get along very well. As there are many hints throughout the show that they have feelings for one another, one significant example is when Robin fights and easily defeats the other Titans when Slade commands him to (The Apprentice). However, it's shown that he actively avoids battling Starfire, and when forced to face her, he refuses to strike her down even when Slade repeatedly orders him to. Robin also defies Slade's orders to be silent, saying Starfire's name before he can stop himself.

Robin is usually the first to jump in and save Starfire when she is in trouble, often catching her when she falls, or shouting her name when she is in danger. There are many times when Robin saves her from falling or being hit by something. Equally, Starfire saves Robin just as often; usually by grabbing him and flying out of danger. Since they are allies and part of a team, these acts are rarely given second thoughts, but Starfire and Robin save one another significantly more often than they save the others.

Though their feelings are seen in almost every episode, there are five main episodes that focuses entirely on their relationship, showing just how much stronger they are becoming while also showing Robin and Starfire growing even closer towards each other. The five main episodes are Sisters, Date with Destiny, Betrothed, Stranded and Go!. The show's finale film Teen Titans: Trouble in Tokyo also has their romance as a major plot point.

Sisters
Sisters is the first episode to show that Robin and Starfire have strong romantic feelings towards each other. At the start of episode, Robin and Starfire are on a Ferris wheel, enjoying a fireworks display together. Starfire is still having a hard time to adjusting to life on Earth, but is enjoying herself. During the ride, she is suddenly snatched by an alien robot. The Titans destroy the robot, and when they return to the Tower they find a surprise visitor: Starfire's older sister Blackfire.

Starfire is at first very happy to see Blackfire, however she soon starts to become upset as Blackfire quickly makes herself popular on the team, due to her rebellious lifestyle and better understanding of Earth. Starfire tries to spend time with her friends, but is blown off as they prefer to hang out with Blackfire. However, Starfire only becomes truly upset when Blackfire is shown to be constantly flirting with Robin. Later on, they all go to a nightclub. Blackfire and the Titans are really enjoying themselves, except Starfire. She goes onto the roof of the club and starts to think that maybe she doesn't belong on Earth after all, seeing that sister fits in much better. Then, to her surprise, Robin appears and ask what's wrong, Starfire tries to avoid the subject, but Robin can easily see that she is distressed. Eventually Starfire explains she is unhappy because she doesn't fit in and is nothing like her older sister. Robin begins to console her, but is suddenly interrupted and (literally) dragged off by Blackfire who wants to dance with him, leaving Starfire by herself on the roof. Later she is attacked by three robots like the one from the Ferris wheel. When Blackfire destroys them practically single-handedly, she is offered the chance to become a Teen Titan. At this, Starfire decides that it's best that she leave the team, thinking that Blackfire is better suited for the job.

Just before leaving, however, she is stopped by Robin. Starfire flies down to him and is about to explain to him why she has decided to leave, but is suddenly attacked and kidnapped by two aliens. As the aliens are about to leave, they are attacked by Robin, who grabbed on to the underside of the ship, saying "No one's taking [Starfire] away." After fighting the aliens, they then learn the truth: the aliens are police, and are after a Tamaranian who has committed many crimes on their home planet: Centuari. Starfire reveals she has never been to the Centuari Moons, but Robin remembers that Blackfire has. The two realize that it's really Blackfire the aliens are after, and she came to Earth so Starfire could take her place in jail. Starfire then soon confronts her sister, fights her and wins. Blackfire is taken away, but not before she swears revenge. The next morning, Starfire is sitting on the Tower's roof. When Robin joins her and asks how she's doing, Starfire replies saying she is sad about her sister, but is glad that the truth was discovered before she was replaced. Surprised, Robin asks what Starfire means. She explains that everyone liked Blackfire so much that it seemed she would take Star's place. However Robin states "Your sister was interesting, but she could never take your place. No one could ever take your place." The episode ends with both Robin and Starfire watching the sunrise together on the rooftop.

Date with Destiny
Date with Destiny is the second episode that focuses on Robin and Starfire's relationship. The villain Killer Moth threatens to release an army of mutant moths on the city unless Robin takes his daughter, Kitten, to her junior prom. Starfire is horrified at the arrangement, but with no other ideas on how to stop them, Robin is forced to agree. Later, Robin tells the Titans to investigate Kitten and find out what her connection to Killer Moth is (unaware that they are related) and Starfire, having found a loophole in "investigating Kitten" acquires a dress and goes to the prom too. Robin is very surprised (and happy) to see Starfire; spending a long time admiring her. When Kitten arrives, he is considerably less pleased, smiling through gritted teeth at Kitten's orders. Starfire becomes enraged with jealousy seeing Robin and Kitten walking into the dance together - so much so that she punches the hood of Kitten's limo so hard, that it immediately becomes destroyed. Throughout the entire episode, Starfire is shown to be out of her mind with jealousy seeing Robin and Kitten together - she even melts a punch bowl and scares a couple when she sees Robin and Kitten dancing. When Robin finds out that the Titans are taking down Killer Moth he immediately dumps Kitten (which makes Starfire very happy). However, to their utter surprise, Kitten reveals herself to be Killer Moth's daughter, as well as the fact that she has the controller that will release the moths. She threatens to release them on the city, unless Robin kisses her. Robin is as disgusted as Starfire is horrified. Just as Kitten is about to kiss him, Robin puts his finger against her lips and tells her "not even if you paid me." He tries to get the controller, but is interrupted by the arrival of Kitten's boyfriend, Fang (a teenage boy with a massive spider for a head) who bats Robin away from her. Starfire then shoots a Starbolt at Fang and asks Robin if he is alright. At the end of the episode after Fang, Kitten and Killer Moth are defeated, the DJ declares Robin and Starfire as the Prom King and Queen. Robin had earlier told Kitten that he did not dance, but at this point he smiles, takes Starfire's hand, and says one more couldn't hurt. Thus, Robin and Starfire share their first romantic dance together.

Betrothed
Betrothed is the third episode that focuses on their relationship. Robin is extremely disturbed and distraught when Starfire announces that she is to marry someone - especially to someone that she's even never met. Upon arriving on Tamaran, Starfire is discovered to be a princess - second in line for the throne - and introduces her friends to her guardian, Galfore, and discovers her sister, Blackfire, is now ruler, as well as the person responsible for her upcoming marriage. Later, when Starfire mistakes a handsome Tameranian for her groom, Robin's reaction of intense disapproval and comical jealousy contrasts to Starfire's approval. When Robin and the other Titans find out more about what's happening, Robin climbs Starfire's balcony and tries to talk her out of the wedding. Starfire tells him she has to get married for the good of her people. Starfire then tells Robin that it's better if he not attend the wedding, knowing full well that Robin doesn't approve of the arrangement. However, before Robin can say anything he is kidnapped. Starfire (having not witnessed or heard him being taken away) sees that Robin is gone and sadly walks back to her room to prepare for the ceremony. However, even though Robin can't fully see it, Starfire is not happy with the situation either, as she is forced into marrying someone she doesn't love. She is willing to go through it, though, because it will save her people. Later, after Blackfire's plot is discovered and Starfire has won the crown, she tells her people that she fought her sister because Blackfire was not best for Tamaran, but neither is she herself. She gives the crown to Galfore, knowing he will care for her planet as he cared for her. Before leaving, Starfire tells him that when she is ready to be married "I shall choose my own husband. Who is to know? Perhaps there is a groom for me on Earth," as she bids Galfore goodbye, and walks side by side with Robin back to the ship, a clear foreshadowing of the future.

Stranded
Stranded is the forth episode. It is also considered to be one of the most important, as Robin and Starfire came very close to finally admitting how they truly feel about each other. At the start, the Titans are attacked by a shrieking alien monster. They are overwhelmed until only Robin and Starfire remain able to fight. They defeat the monster, and whilst they congratulate each other, Cyborg teases Robin about his and Starfire's relationship by calling Starfire his girlfriend. Robin becomes both shocked and embarrassed at the suggestion and starts to hyperventilate. He also notices that everyone (minus Raven) have smug looks on their faces revealing that they are all fully aware of how Robin and Starfire truly feel about each other. Still embarrassed, he yells "SHE'S NOT MY GIRLFRIEND!" which shocks Starfire so much that she falls to the ground. She becomes confused and very angry, but as Robin starts prepare himself from some uncomfortable questions from her, they hear a loud shriek: the alien monster is revealed to have survived the fall and starts to destroy the station. The Titans are able to escape the station before it explodes, but the monster eventually causes them to land separately on an alien planet.

After landing, Robin starts to look for the others, and he comes across Starfire's pod first. Inside it, however, he finds a slug creature. Believing the monster to have done something to Starfire, Robin attacks it, but its slimy body makes it difficult for him to fight and it almost eats him. Luckily, Robin is saved by Starfire. He runs towards her, relieved that she's alright, but to his surprise Starfire doesn't act like her usual self; stand-offish and indifferent. Starfire then says they should start looking for the others, and for the most part, ignores Robin. While searching for the others, Starfire keeps moving away from Robin every time he gets to close to her. Starfire reveals she is giving Robin "the space" as he requested back at the station, which reveals to Robin that Starfire is still hurt. She suggests that they would have better luck looking for the others if they split up, Robin however is against the idea and asks if she could just talk to him. Star asks him if he is finally ready to explain why she isn't his girlfriend. This makes Robin nervous which makes Starfire go back to ignoring. Later, Robin almost falls into a lava-pit, but is saved by Starfire. Despite this, Starfire continues ignoring him. Thinking she has misunderstood what girlfriend means on Earth, Robin starts to explain, but to his surprise Starfire is revealed to already be aware of what girlfriend means. Robin and Starfire soon find themselves on different parts of the mountain and the ground beneath them breaks apart and the two of them end up falling, Robin is able to save himself, but to his surprise, Starfire reveals that she is unable to use her powers. Robin jumps down to save her and the two of them land safely in a cave. Now that they are safe, Robin asks Starfire why she was unable to use her powers to save them, and she reveals that her powers are connected to her emotions. She can't fly or shoot star-bolts is because she was upset and started to fear that their relationship won't be the same; since he won't admit how he really feels about her. Robin starts to explain how he really feels about her, albeit somewhat awkwardly. He says that "It's awesome the way [she] shoots starbolts." and that "It's cool that [she's] brave and the strongest girl ever". Starfire asks him if he doesn't mind having a girlfriend, but before Robin can answer her they are suddenly attacked once again by the monster. As they fight, Starfire regains her powers. They are cornered onto the edge of a cliff, and with no way of escape Robin says it's time to fly, Starfire is nervous, but Robin reassures her by taking her hand and telling her as long as they're together, it will be okay. They both jump off the cliff and Starfire regains her flight abilities. They safely fly to the top of the mountain, look into each other's eyes and with Starfire having forgiven him, they share a hug.

Go!
Go! is a prequel to the series and reveals how the Teen Titans first met and how they were first formed. It's also the filth and final episode focusing on Robin and Starfire's love for each other and also reveals exactly how they first met and how they both developed their strong romantic feelings for each other. When Robin and Starfire first met their relationship was rather rocky at the start since Starfire had been prisoner for so long and she was in a place that was still very new to her. However (by the end of the episode), Robin and Starfire's relationship greatly improved and shows that they have both developed strong romantic feelings for each other.

At the beginning, Starfire is revealed to be a prisoner of the Gordanians and is fighting her way off of their ship, she quickly escapes and flies off on the planet Earth to get away from her alien captors. Robin (having just left Batman) decides to become a solo hero at Jump City and is fighting a thief when he notices a bright green light fast approaching the city. He soon finds himself an alien girl destroying everything around her and soon starts to fight her. Robin soon realizes that she is much stronger than she looks and that he can't handle her on his own. He soon finds himself getting help from his future teammates: Beast Boy, Cyborg and Raven. Raven then realizes that the girl isn't trying to destroy the city, but she is merely trying to get out her restraints. At this, Robin begins to approach Starfire. She is very tired, but quickly becomes battle ready to defend herself, however Robin approaches her slowly and calmly explains to her that he just wants to help by showing his lock-pick. She lowers her starbolts and allows Robin to remove her restraints. When they are removed she grabs Robin and kisses him. Just as suddenly, Starfire then pushes him away and starts to speak English, she tells him "If you wish not to be destroyed, you will leave me alone!" and flies off leaving Robin still surprised over the kiss she gave him. Shortly after Starfire, Robin decides to track her down in his own to see if she is a threat to the city. However, the city is then invaded by Gordanians, and they find Starfire at a video store where she explains the situation. During a fight, Starfire almost gets herself captured again, but is saved for the first time by Robin. The Gordanians retreat and their leader threatens the planet for the interference. Starfire blames Robin as she told him to stay away from her. Robin however then becomes mad at her as he states "My fault?! You blast me, you KISS me, but you never stop to mention that they have a gigantic particle weapon?!". The fighting eventually stops and the group again resume their fight against the Gordaians to stop them from destroying the city by sneaking into their ship. Once they are inside the ship, the Titans go to look for the Control Room. While searching for the room, Robin and Starfire share a private moment where they both apologize to each other for the fight they had earlier. Starfire claims that on Tamaran the only person to ever show her kindness was her guardian and Robin explains to her that things on Earth are very different and they share their first romantic moment together. However, they are interrupted by Beast Boy who then alerts them to the arrival of Gordanians. Later on long after they won the fight against the Gordanian's, Starfire appears wearing clothing from her own world. Robin comes forward and says that he still doesn't know her name and she then explains that in English, she is called Starfire. Robin gives her a formal welcome to Earth and Starfire thanks them for their bravery and help. She says that she wishes to stay on Earth, and that even though the people appear strange, they are also very kind. Starfire and Robin start blushing from her comment knowing very well that she meant that she is also thanking Robin for the kindess that he has shown her the time she has spent on Earth so far. This marks as the beginning of not only of the Teen Titans, but also the beginning of a beautiful relationship that will someday blossom between Robin and Starfire.

Other episodes
However, even though their relationship is not the focus of every episode, there are subtle hints and affirmations in most episodes.

For example, when Mad Mod is explaining to Starfire why her starbolts aren't working, Robin becomes protective of her and tells Mad Mod to get away from her.

In For Real, Control Freak jealously claims that Starfire is "too good for Robin, he'll never appreciate her!" to which Más y Menos (who also have crushes on Starfire) agree (incidentally, the only time these two brothers fight is when they compete against one another for her affections).

In Revolution, when Mad Mod takes Robin hostage, Starfire is shown to more worried about him than any of the other Titans. When the Titans are deciding over which course of action they should take, Starfire thinks that it's best that they find Robin and restore his youth so that he may lead them to victory. When the Titans decide to go with Starfire's plan first, they track Robin through his communicator. The Titans seemed to have found him and when Starfire goes to hug him, they find that "Robin" is nothing more than a hologram. Later, when the Titans have successfully defeated Mad Mod and restored Robin's youth, Starfire is shown hugging Robin (with hearts in her eyes) happy that he is back to normal.

In The End - Part 2 when Starfire was fighting her Nega self, she was using Starfire's inner feelings against her so while she was fighting her, her Nega self taunted Starfire regarding her feelings for Robin and kept telling her when the fight was over, Robin would be "all hers".

In Snowblind, Starfire leaves by herself to track down the monster on her own, Robin, worried for her safety yells her name, but she ignores him. Later, before she collapses in the snow, she weakly murmurs "Robin...". It is later shown the rest of the Titans waiting near the broken down T-Ship, Robin decides to go after her, but the other are against the idea as he wouldn't be able to survive in the storm, though he listens to his friends Robin remains very worried about Starfire. While Starfire is missing, Robin is looking around the area seeing if Starfire has come back yet, Raven tries to assure him by telling him Starfire can take care of herself, and Robin replies, "That doesn't mean I can't worry." When they find her at Red Star's home, Starfire hugs Robin before looking to see the rest of her friends.

Teen Titans: Trouble in Tokyo
In the series finale movie Teen Titans: Trouble in Tokyo, it not only served as the series finale to the show, but it also served as a vital part in the growing relationship between Robin and Starfire. At the beginning when the Titans are chasing after the villain Saico-Tek, he attacks Starfire and makes her fall out of the sky, but luckily Robin saves her when he grabs her hand and they both ride on his R-Cycle together to catch Saico-Tek.

When the Titans first arrive in Tokyo they have some trouble with the language since non of them are able to speak Japanese. However, Starfire claims that she might be able to help and, to the shock and surprise of her friends she suddenly grabs a teenaged stranger and kisses him. Out of all the Titans, Robin is the most shocked, and he becomes very jealous that Starfire kissed the boy, even though it was for a reason. Robin also seems to realize that the reason why Starfire kissed him when they first met was just so she could learn to speak English, which makes him more upset, as he most likely believed it was an entirely romantic action. When the Titans decide to explore Tokyo separately, Starfire and Robin go to explore Tokyo together. By sunset they have explored a great deal of the city, and retreat to the rooftop of the Tokyo Tower. There, Starfire mentions about the kiss she shared with the boy earlier, while also discussing the kiss they shared with each other on the day they first met. They start to discuss the topic and its uses on Tamaran and Earth. Where on Tamaran it is merely a way to transfer certain amounts of information and knowledge, but now Starfire has now learned that on Earth it means "more".

Robin and Starfire then start to get more comfortable about the subject and they finally start to express their true feelings for each other. Just as they are about to share their first true kiss together, Robin backs away at the last moment just having discovered a new thought about Brushogun. Robin then states that he is a hero only and that there is nothing between them. This greatly upsets Starfire and she flies away crying.

Later on, Starfire is seen in front a store watching two robot mice kiss each other, making her depressed. A little girl comes up to her and tries to ask what's wrong. Starfire says that everything is fine but as the girl leaves Starfire starts to follow her and finally admits that she has had feelings for Robin ever since the day the two of them first met. Starfire then starts to say that maybe she was foolish to think such things, to think there was anything between her and Robin. The little girl then gives her a hopeful smile and Starfire finally realizes that there has always been something more between her and Robin and that she won't give up on them. When Robin goes into hiding to avoid being captured by Commander Daizo and the Tokyo Troopers, he takes on the disguise as a mugger and goes to find information about Brushogun. However he is soon discovered by them and Robin gets into a car chase. Robin almost gets himself captured again, but thankfully Starfire saves Robin and the both fly off together to a secret hideout. While there Starfire explains to Robin about the current situation and gives him a fresh copy of his uniform. Starfire is about to leave, but Robin grabs her arm just before she goes. They both share another tender moment and attempt to kiss again, but are interrupted by the arrival of Beast Boy and the other Titans who barge in on them. When they defeat Commander Daizo, Robin then tries to reveal his true and strong romantic feelings for Starfire but getting the message she silences him by simply saying "Robin... stop talking," and they finally share their real kiss. In the end, Robin and Starfire are seen holding hands and have finally become a romantic couple.