Eren greatly admires Annie, and was trained in her unique fighting style during their years as Trainees. He considers her to be a kind person beneath her cold exterior, and credits her with making him aware of the contradictions within the military system. He is horrified upon learning that she is a Titan, and becomes so conflicted he is initially unable to transform. Even while fighting her, he continues to wonder about her motives of antagonizing humanity and expresses concern for her.When Eren failed to transform into a Titan to face Annie in the Inner Wall, Mikasa says that it may be due to Eren harboring “Special feelings" for her.