Levi - Yenra Picture Wiki
Levi of Attack on Titan is known as humanity's most powerful soldier and head of an elite squad in the Survey Corps.
While it is said that he is blunt and unapproachable, it is noted that he has a strong respect for authority, structure and discipline. Despite his strict nature he cares very much for his underlings and team mates. He was shown to be deeply affected by the deaths of his Special Operations squad.
The sidestory Attack on Titan: A Choice With No Regrets focuses on Levi's origins, revealing that he was part of a band of thieves using the Vertical Maneuvering Equipment to commit crimes before he is scouted by Erwin to join the army. Captain Ackerman later notes that the capture of Eren and Krista has to do with Levi, whom he refers to as "Levi Ackerman". Levi was modeled after the Watchmen character Rorschach and is named after a child Isayama noticed in the documentary Jesus Camp.
Levi is voiced by Hiroshi Kamiya (Japanese) and Matthew Mercer (English)