Armin Arlert

Armin Arlert, who held the position before Hange Zo's passing, is the fifteenth and current commander of the Survey Corps. He might not be the strongest of the 104th Training Corps soldiers, but his intelligence and strategic acumen make him a priceless asset, especially when paired with Hange. He acquired Bertolt Hoover's control of the Titans after the Shiganshina District conflict and gained ownership of the Colossus Titan.

Armin Arlert was undoubtedly the underdog in the Attack on Titan series. He was a pacifist at first and was cautious. Even when he was mistreated by adults older than him, he detested fighting. As the Attack on Titan story went on, Armin progressively lost his shyness and patience in the fight against the Titans. He has become a violent genius who won't hesitate to kill someone to protect his friends and Paradis.

Despite Armin Arlert's character changes, the Attack on Titan series has never seen a character with Armin's level of strategic insight. Armin isn't much of a help in actual combat. His true mastery rests in his capacity for deduction and spontaneous planning.

Given his tactical abilities, Armin quickly identified Annie as the mole and saved his teammates. He has created techniques on his own that have made it simple for the forces of Paradise to defeat their opponents and win battles.

Anime: Attack on Titan

Watch here: https://www.crunchyroll.com/series/GR751KNZY/attack-on-titan