Armin was the brother of cassidy until cassidy was mysteriously went missing and they never found his body. armin still searched for his missing brother. little does he know his brother isn't that far away.. Armin is daring and brave, but if very sensitive and has big emotions, he fights titans and is friends with Eren Jeager and Mikasa Ackerman. he is the commander of the scouts. Armin is 18 and possesses the colossal titan.