Due to his ambitious, fiery personality, I find Eren to be the aromantic sort that’s more focused on his broader personal goals than fostering a relationship. Despite that, I really love the idea of him with Armin, they seem to be such a sweet duo that I like to imagine building a relationship together as they mature.
Aha for now that’s all I can think of. I love headcanons though so if you have any that you want to share, feel free to share them <3 and you’ll likely get me on board with any ship.