Dita Ness

Dieter Ness (ディータ・ネス) was a member of the Scouting Legion and the leader of one of the units in the 57th Expedition.

Story
Dieter Ness first appears as an instructor and unit leader in the expedition mounted from the Karanese District into the Titan-infested lands outside Wall Rose. He encounters a deviant Titan in a field, where he uses his Three Dimensional Maneuver Gear to sever the Titan's ankles, causing it to fall over and allowing his squadmate Luke Cis to destroy the nape of its neck. However, they then encounter the Female Type Titan, who easily kills them both when they attempt to engage her.

Trivia
Dieter is a German name meaning "people ruler", possibly in reference to his initial role as a mentor to Eren and other recruits.