EreJean

EreJean is the slash ship between Eren Jaeger and Jean Kirstein from the Attack on Titan fandom.

Canon
Eren first knew of Jean on the first day of enlistment, where Shadis asked of his name, origins and why he's here. Jean replies by saying that he'll join the Military Police and live safely in the interior, at what Eren simply looked at him. They officially met while Eren talked about his dreams to defeat all of the Titans. Jean replies by asking if he's out of his mind. The latter recognizes Jean as the guy who wants to take it easy by joining the MPs. He then retorts how his dreams are better than someone who shakes in his boots and pretends to be brave. This stirs an argument between the two, and starts a rivalry. Later, Jean proposes to call a truce, which Eren agrees to do. As Mikasa is heading out, Jean notices her and compliments her hair, developing a crush. Then, he sees Eren, who is asking her to cut her hair. She then says that she will, earning a grudge from Jean's side. The next day, Eren is having problems with his gear, and how he's using it. There, Jean can be seen laughing at him. Later at night, Eren asks for help, only for Jean to mock him and sarcastically ask if he wants help to keep his sanity safe after embarrassing himself in public. While this is an anime-only scene, during their training days, Ymir, Krista, and Daz go missing, and Eren puts them in priority, saying that they should go save them at once. Jean, along with other fellow cadets, are willing to help him.

Eren is then stationed with Levi's Squad. Later, Eren notices Jean and the others, and asks if he can go see them. When arriving over to them, Mikasa starts talking to him, until Eren asks where Marco is. Jean claims that he died, and then tells him that everybody is counting on his Titan powers. Eren is left shocked and confused, and is forced to go back to Squad Levi. Due to their separation, no interactions have been put between the two, especially during the 57th Expedition. When formatting a plan to capture Annie, Jean dresses up as Eren. Armin mentions how they both have similar faces and terrifying glares, angering Eren, who retorts by claiming that he has such a horseface, they look nothing alike. Jean is present during his battle against Annie, and when he is pulled out of his titan. Eren is then left in bed, and Jean stays by his side, with Mikasa and Armin.

Days later, Reiner and Bertolt reveal themselves as titans. When Eren is captured, Jean, along with the other Scouts, form a plan to save him. While this was an unanimated scene, extra pages in the manga showed the two talking after saving Eren. There, he looks around and sees injured soldiers, before asking how many of them have died. Jean replies to his answer and explains to him the number of lives lost on their way. Armin then asks the latter if he controlled the titans with his powers, forcing Reiner and Bertolt to retreat, which shocked Jean. Then, he continues and says that in order to get him back, Erwin's arm was bitten off, Mikasa's ribs were smashed, and half of the soldiers died, including Hannes. This may have implied that Jean did know about Eren's life somewhat well, at least well enough to know that he was close with Hannes. He rather jokingly says that he's not sure if he's worth the price, but says that the soldiers who were killed depend on him. They then look at each other for a while, before Eren mocks him for being preachy, although Jean retorts back and calls him an indecisive whiner. Eren then stares at his fist for a while, while Jean argues with Connie and Armin, before he thanks Jean and tells him that he doesn't have to hesitate anymore.

Weeks later, and amongst other comrades, the two are chosen to be in Squad Levi. When Jean and Sasha walk in together, Eren desperately asks if they've brushed the dirt and dust on them before entering, which Jean tells him that they didn't have time to do that. He then yells at him, and adds that Levi wouldn't be happy with that, and later it was then said that Eren made Jean's bed, which caused Jean to shout at him and ask him if he's his mom. After Mikasa comes back with Historia after chopping wood, Eren says that she was doing sit-ups, even after getting her ribs broken. The latter then yells at him again, questioning him whether he was peeping on her. Later that night, Nifa comes to them, and gives Levi a note, telling them to leave the place before the MPs come in. When they escape, the two are seen looking down at the soldiers barging in.

When Jean is able to find an opening and blow Eren's head off, he tears up, calling him a suicidal blockhead one more time.

Fanon
It's one of the most popular slash ship for the two, with Eren's coming in third and Jean's coming in second on AO3, but makes it in the top ten in the relationships tag. This ship currently rivals EreMika and JeanKasa, as Mikasa and Eren have a crush on eachother, and Jean has a crush on Mikasa. Those fans who appreciate Eren and Jean's dynamic see them as rivals, who become friends, and then lovers. Considering Eren and Jean's interactions are often charged, coming together and resolving this pent-up tension is what most fans like to explore in their fanworks. Often fanfiction features the ship living and interacting in the modern world, either as students or classmates. Fans of Attack on Titan sometimes jokingly say that Eren and Jean are participants of a love quadrangle, as Jean loves Mikasa, Mikasa loves Eren, Eren loves nobody, and nobody loves Jean.

Fandom
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Trivia

 * Eren is the one responsible for nicknaming Jean, "horse face" or "umazura" in Japanese.
 * Jean impersonates Eren twice, for the safety of the latter. Both times disguise is successful enough for others not privy to the secret to let the stand-in go unnoticed. Both times Jean wears a dark-haired wig, meaning he mostly resembles Eren the way he is.
 * Jean also calls Eren a "suicidal blockhead" or "suicidal bastard" in translation.
 * According to Isayama, if the 104th were to have an arm-wrestling contest, Jean and Eren would be evenly matched.

Variations

 * EreJeanKasa refers to the ship between the two and Mikasa Ackerman