Portrayed by: Kanata Hongō

Armin is Eren's childhood friend who joins him in the Scouts. He has an inferiority complex, believing he barely passed the combat graduation exam (but was top of the class academically),[ch. 3] and whining that he hates being cowardly and having to rely on friends all the time.[ch. 11] Despite his self-perceived shortcomings, he vigorously defends Eren when the Military wanted to fire cannons at them, and is able to bring Eren out of his feral Titan state following the latter's second full transformation where he attacks Mikasa,[vol. 3] Armin also convinces Eren to let go of his inhibitions regarding Annie so that he could transform and fight her in his Titan state. In the military, he impresses the higher-ups by deducing the human identity of the Female Titan.