EreJean

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

Canon
The first two interacted when Eren mentions about joining the Survey Corps, Jean interrupts Eren's conversation by calling him nuts for wanting to joining the Survey Corps, as during that time it had the highest fatality rates. Eren answers back to Jean telling him if he was joining the Military Police to have a nice easy life, Jean agrees with Eren and tells him he's just being honest. Jean continues to tell Eren that being a Military Police officer is much better than trying to act 'tough' as Jean thinks Eren might be afraid. Eren stands from his seat where Jean does the same, the two face off to what seems it might start a fight until the bell rings. Jean apologizes to Eren and tells Eren it's best to let it go, Eren agrees and the two head off. Following behind Eren is Mikasa, Jean spots Mikasa and compliments her before she heads off with Eren, Jean begins to follow her until stopping he sees Eren and Mikasa together, Jean is shown to have a grudge against Eren after this. A few nights later the two get into an argument again, this time it was due to Jean joking about his technics when it comes to the ODM gear, which very much angers Eren. Eren grabs the hem of Jean's shirt before being stopped by Mikasa, Jean becomes jealous and loses his temper. As the fight begins to get physical, Eren grabs Jean's wrist before slightly beginning to push him and in order to kick Jean's leg, which flips Jean making him hit the floor very hard. Due to the loud noise it is immediately heard by Keith Shadis, he questions about the noise until being covered by Mikasa explaining Sasha passed out some gas, covering both Eren and Jean's quarrel.

When Jean's mother comes and visits Jean, Eren meets Jean's mother and she asks Eren where Jean was. Later Jean is seen to be embarrassed with his mother as she'll ask constant questions before he yells at her to stop. He pushes his mother by telling her to go home, she continues to provide apples to those before Jean pushes the apples off the table and Eren yells at him, Eren picks up the dropped apples and is seen holding it. Jean kicks his mother out of the area until Eren tells Jean that he should be more nicer to his mother.

Fanon
It's one of most slash ship for the two, with Eren's coming in third and Jean's coming in second on AO3. This ship currently rivals Eremika and JeanKasa, as Mikasa has a crush on Eren, and Jean's crush on Mikasa.

When Eren told Jean that he should be nicer to his mother, fans believed it was most likely the fact as Eren's mother was killed and Jean should appreciated his mother.

Fandom
 FAN FICTION 

Trivia

 * Eren is the one responsible for nicknaming Jean, "horse face" or "umazura" in Japanese