Christa perspective
Historia had always envied Eren for always knowing his goals and being able to work toward them. Eren had initially disliked her Krista persona, seeing it as phony. Since the revelation of her true identity, Eren has come to respect her as a "stupidly honest and regular person." His statement that he likes her better as Historia meant a lot to her, and it motivated her in great part to stand up to her father and try to save Eren's life, rather than consume him
Eren perspective
Eren did not initially interact with Historia very much, and had in fact secretly disliked her because he felt she was a phony. However, once her true identity was revealed and her demeanor began to change, Eren began to see her as more "honest" and warmed up to her. He even accepted being eaten by her if it meant the annihilation of all Titans, which shows deep confidence in her.
So in aot it might be cannon but I think that Christa and Armin is better and cannon.
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Aot ships
FanfictionHere i will react to aot ships .this will contain *MAJOR SPOILERS* read at your own risk.