Erwin Smith

Irvin Smith, sometimes known as Chief Elvin, is the commander of the Scouting Legion. Far-thinking, intelligent, respected, Irvin is an able commander and while he cares as deeply for his men as Rivaille, he would not hesitate to sacrifice them for the future of mankind. He developed the "Formation for Long Distance Enemy Dectection.

Personality
Irvin is portrayed as serious and calculating. While he trusts his men, he is the first to realize that there is a spy interfering with the Scouting Legion and arranging for his/her capture. He is an eloquent speaker, able to sway many people, such as the war tribunal held to judge Eren and the trainees choosing recruitment branches to join.