ZoRobin

ZoRobin is the het ship between Roronoa Zoro and Nico Robin from the One Piece fandom.

Alabasta Arc
After the Straw Hats left Alabasta, Robin showed herself after hiding herself on board of Going Merry. She then told them that she wanted to join the crew, which was eventually accepted by Luffy because he said that she didn’t do anything wrong. Although most of the Straw Hats had accepted her as a crewmate, it was Zoro who remained wary of Robin due to her being a former enemy as well as being the vice president of Baroque Works. She used various tricks to gain the trust of her crewmates, she never tried to trick Zoro into accepting her —  she just gave him a smile.

Jaya Arc
Cricket had told the Straw Hat Pirates to look for the South Bird in the woods. The South Bird will be the one guiding them to where the knock-up stream was located, making the Straw Hats split into groups. Robin and Zoro were paired up as a team during the hunt for the South bird. But as they hunt for the South Bird, Robin tells Zoro to stop killing the bugs that got in their way. But Zoro dismissed what she said. He even said it was the bugs’ fault for getting in his way. Zoro also added that he was still wary of her and she was still hiding her true intentions.

Skypiea Arc
The Straw Hats seemed to be overjoyed upon arriving in the sky island. Before leaving Going Merry, Robin opens up first to Zoro. She talks about how she never thought sailing could be adventurous. After that, Robin and Zoro were the last one to jump out of Going Merry. After Enel had defeated Gan Fall, he then said that he would take the remaining five to Fairy Vearth. But Robin then asked what if they refused, what happens after that. Enel said that he had already decided. Robin then said if he did that, Enel would destroy the things he wanted in Skypiea. However, Enel had traced Robin’s actions, and said he already knew where the bell was located. Enel said that he despised conniving women from trying to manipulate him with her information, thus striking a lightning bolt on Robin. Zoro's protective nature was shown despite not trusting Robin, hence catching her in his arms after she was struck by Enel's lightning.

Long Ring Island Arc
As Aokiji was about to attack Robin with his Ice Saber, Zoro unsheathed his sword immediately, blocking his attempt to attack Robin.

Water Seven Arc

 * Although he still fully didn’t trust her, Zoro gave Robin the benefit of the doubt when she apparently had betrayed them.

Quotes
"She is a woman."

- Referring to Zoro's words when Enel struck Robin with lighting in episode 180 in the anime while chapter 275 in the manga of Skypiea Arc.

Fanon

 * There is a day dedicated to ZoRobin and it is on November 26. Fans have come up to this day because the number 11 was derived from Zoro’s birth date on November 11th, while the number 26 is derived from Robin’s birth date on February 6th.
 * The popularity of the pair began on the Skypiea arc. ZoRobin fans tend to say  that it is one of the best arcs for the pair. From Zoro on being wary to Robin to fully recognizing her as a crewmate. One of the iconic moments that drew fans with the pair was the time when Zoro caught her in his arms after Enel brutally attacked her with his lightning— it was then that Zoro was still wary of Robin before that event.
 * When Zoro first used Asura during his fight with Kaku on Enies Lobby, its appearance was an illusion that looks like a "demon god with three heads and six arms." With that, fans noticed that his nine-sword style was similar to the way Robin sprouts hands with her devil fruit.
 * ZoRobin fans headcanon Robin and Zoro as ‘parents’ of Chopper, the resident doctor of the Straw Hats. Throughout the series, both Zoro and Robin have shown that they care a lot for Chopper.

Fandom

 * FAN FICTION
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Trivia

 * Robin’s official color is violet, while Zoro’s official color is green.
 * In Eiichiro Oda’s 1994 Monster manga, there are some parallels that can be linked to the pairing — Zoro’s resemblance with the samurai Ryuma and Robin sharing a similar tragedy with the heroine Flare who is the only survivor of her village that was ravaged by a dragon.
 * In the 11th cover art for Alabasta, a Straw Hat Pirates vs Baroque Works color spread shows the rest of the Straw Hats facing the foe they are going to fight against. Zoro, sneering, is matched against Robin despite her being the only one to not fight in any of the battles.
 * Zoro and Robin's relationship with Chopper can be seen as a mother and father.
 * In Chapter 562, Robin is featured in the cover art being imprinted by a flock of ducks while an independent duckling with three sticks similar to Zoro is seen waddling in the other direction.