Levi Ackerman

Levi Ackerman, a captain in the Survey Corps, possesses strength equal to that of all humanity because he is of Ackerman blood, the strongest human race. He is a cold and unfeeling character, showing no emotion or empathy. He is incredibly strong, brave, and has a sharp tongue. However, he cares deeply for his teammates and protects them from the Titans that threaten humanity from within the walls. He has an added obsession because he lived in an underground city filled with murderers and greedy merchants. His mother, Kochel, was a prostitute, so Levi is illegitimate and doesn't even know his father. He loved his mother dearly, but she died, leaving Levi by her body as a malnourished infant. He didn't eat, bathe, or move until his uncle Kenny took him in and taught him how to use knives, turning him into a ferocious beast capable of defending himself among monsters. Kenny eventually abandoned him, and Levi grew up to become one of the strongest men underground until Commander Erwin took him into the Survey Corps, where he became Corporal Levi Ackerman, the strongest soldier in humanity.

He is extremely rude, but brave, strong, and loyal. He never smiles, doesn't allow anyone to touch him, is obsessed with cleanliness, has a sharp, cheeky tongue, and now considers pain the best form of discipline.