Armin Arlert is one of the main protagonists of the anime/manga series Attack on Titan and Eren Yeager and Mikasa Ackerman's best friend. Although physically and emotionally weak and hates having to rely of Eren and Mikasa, his strategic abilities and intelligence have saved Eren and Mikasa multiple times. He is instrumental in discovering the identities of the Titan infiltrators, and becomes one of the Survey Corps' most vital members. He is voiced by Marina Inoue in the the Japanese version of the anime and Josh Grelle in the English version.