Levi

Levi is known as humanity's most powerful soldier. He's ranked as Captain of the Scouting Legion division. Levi is also the leader of the Special Operations Squad, an elite team that he hand-picked in order to protect Eren Yeager. While it is said that he is blunt and unapproachable, it is noted that he has a strong respect for structure and discipline. There are rumors that he was originally part of underground crime before he became a soldier. Although he often appears to be unfriendly, he cares deeply for his team and has never undervalued human life. He is also a notorious clean-freak.

It is later revealed that his full name is Levi Ackerman.

Note: Levi is the official English translation by Kodansha.