Levi Ackerman

Rivaille (リヴァイ) is a corporal in the scouting legion, and is said to be humanity's most powerful soldier.

Personality
He is a clean-freak. While being often blunt and unapproachable, he has a strong respect for structure and discipline.

History
He is rumored to have originally been part of underground crime before he became a soldier. After a while he is then picked up by the current commander of the scouting legion.

Plot
After Eren gets out of his Titan body and is surrounded by titans, Rivaille comes back from his tour and rescues the group from them. Later on, after Eren wakes up in a cell, Rivaille insures him that the higher-ups will let him join the Scouting Legion and that he will make sure Eren doesn't get out of hand. During the trial, after Eren gets out of hand with his words, he beats Eren down, much to Mikasa's anger, as he teaches him his place. This was just an act to get the people to think that Rivaille can keep Eren down and that the police force cannot, assuring them that the Scouting Legion will take care of him.

Rivaille then assigns a new elite group that will protect Eren in their next tour. During their stay at the castle, Rivaille makes sure Eren is kept tamed and makes him sleep in the dungeon. Everyone in his special team respects him, and one of them even tries to talk like him, albeit failing at it. Rivaille was one of the only people that weren't afraid of Eren when he started to turn into a Titan, and he took charge quickly by calming the team down.

During the tour to go in and out of the wall, Rivaille and his team lay in the back of the formation, not seeing any danger for a while. It wasn't until they got to the forest that they encountered a Titan. Eren could have defeated the Titan at that time, but Rivaille's team convinced him otherwise. Rivaille gave him the choice, but he didn't. Later on, after capturing the female titan, Rivaille and the commander try to cut it open but to no avail. The scouting legion then retreated after the female titan screamed and got attacked by a huge group of titans.

After the female titan came back and killed Rivaille's team and kidnapped Eren, Rivaille and Mikasa both joined forces to get Eren back. Rivaille told her not to try to kill it since they probably couldn't, so they decided to cut it up and get Eren out of her mouth. After many simultaneous attacks, Rivaille was able to take Eren out of her mouth and retreat with the others.

Abilities
Rivaille is excellent at using the 3D manuver gear, to a point that everyone says he is the best at it. He is also said to be as valuable as 100 men, far out weighing all of the other soldiers. He is said to have been extremely strong even before joining the scouting legion.