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. While the two are walking and talking Eren calls her "amazing".

Eren refrains from telling anyone about Dina for an entire year because he fears Historia will be turned into a titan as a result.

Eren smiles at Historia when she expresses her delight at having Hizuru as an ally and stands up against the idea of Historia sacrificing herself and her children for the future of Eldia, suggesting they search for a better option.

Fanon
Some fans are currently speculating that Eren is the father of the child Historia is now carrying. However, the possibility of this is only very slight since he was opposed to the idea of sacrificing her in the first place. In addition, Eren is destined to die in four years (due to Ymir's curse) and, thus, will not be able to continuously impregnate Historia for 13 years.

Fandom
AO3