EreHisu

EreHisu is the het ship between Eren Jaeger and Historia Reiss from the Attack on Titan fandom.

Canon
In the "Distress" OVA, Eren refuses to abandon Historia (then Krista) when she is taken hostage by thieves, and is even willing to rescue her without the help of the others. He does, however, accept the help of Jean and the two of them end up rescuing her with team work.

Eren openly states that he likes Historia as a person, a sentiment which genuinely makes her happy. Eren’s admiration and respect for Historia only deepens when she defies Rod by throwing him to the ground. It is then Historia tries to rescue Eren because she can not stand to hear him crying about his worthlessness.

When Eren suggests allowing himself to get eaten by Rod, Historia instantly puts this idea to rest using logic. She then comforts Eren about his father, explaining that Grisha had to take back the founding titan for the sake of humanity.

Eren later thinks to himself about how strong Historia has become when she is talking to Erwin and fighting for her right to settle her own fate.

Eren speaks fondly of Historia while he, Jean and Armin watch her scolding some kids on her orphan farm. As the two are walking and talking Eren calls her 'amazing' which makes her blush.

Eren refrains from telling anyone about Dina for an entire year because he fears Historia will be turned into a titan as a result. Another year later he smiles at Historia when she expresses her delight at having Hizuru as an ally and is the first to stand up against the idea of Historia sacrificing herself and her children for the future of Eldia, saying they should search for a better option.

Fanon
Some fans have noticed the strong connection between Eren and Historia and believe the two could have become more than friends had the situation played out differently (Historia is now with a man she doesn't love and has to continuously procreate with him for the 13 years she will have left to live after inheriting the beast titan).

Fandom
AO3