JeArmin

JeArmin is the slash ship between Jean Kirstein and Armin Arlert from the Attack on Titan fandom.

Canon
In the "sudden visitors" OVA Armin was in team with Jean and tried to help him beat Sasha. When Armin broke his leg he was unhappy that he could no longer be of use to Jean.

On their first scouting mission, Jean admitted that Armin used to creep him out, but he always believed in his abilities.

Jean and Armin had many scenes together during and after the rematch between Eren and Annie.

Armin tried to protect Jean after he was knocked unconscious during the Scouts' operation to retrieve Eren. On their return back he and Jean were on horseback together, Jean still barely awake.

When Jean was about to be killed by one of Kenny's subordinates, Armin shot her to save his life.

When Armin and Jean were disguised as Historia and Eren, Jean struggled to watch as one of their captors felt up Armin and made him cry. Later when Levi instructed Armin to fix the man's gag, Jean did it for him to spare him any more distress.

Armin confided in Jean about the real death of his parents explaining that they were killed by Military Police, showing a deep level of trust.

Jean seems to place great faith in Armin as shown when he repeatedly turned to him for advice when their situation became dire during the Battle of Shiganshina.

When Bertolt burned Armin, Jean cried at Armin's supposed death and was relieved and emotional at his revival.

Fanon
Armin and Jean are seen together at the end of some volumes like volume 21.

JeArmin is shipped mainly by manga readers and a few anime viewers. It is one of the most popular yaoi ships in Attack On Titan.

Fandom
AO3