Eren x Historia is pure kino on so many levels. Outside of the obvious fact that this couple is aesthetically pleasing, it also simultaneously btfo two of the most obnoxious groups of shippers : the Shitkasa self-inserters, and the delusional Yumikuri dykes. This ship comes out of left field at first, literally nobody expected it, but it makes so much sense from a character and storytelling standpoint, because Eren and Historia both faced the same existential crisis and their bond was cemented during their ordeal in the cave. This is not some fancy romantic relationship, or love at first sight, or superficial attraction, this is something more subtle, this is an indestructible bond built between two people who overcame their darkest hour together because they were inspired by one another. Everything else like the parallels with Grisha and Dina, or the Goddess/Devil analogies are just cherry on top. With Eren and Historia, Isayama blessed us with a masterclass on how to write couples in fiction, everyone who is against Eren x Historia is against great storytelling.