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Along with his flustered appearance, Hannes wears an orange jumpsuit and sports with a mop of blond hair. He also has a light mustache planted on his face.
Hannes is usually in a drunk state but is a very concerned person for his school and acquaintances.
Hannes is the referee of the dodge ball match the school holds. One time in the game, he gets hit by the ball thus knocking him out.
Passing by Rico Brzenska and the group she is training, Hannes offers some help to a worn out Eren by giving him a demonstration of how to properly use the omni-directional mobility gear. Not knowing about the gear's damaged state, he proceeds to fly. Unfortunately, the gear busts and he collides with Jean. As he gains back to himself, Hannes confronts Eren convincing him not to give up and that he failed because he is drunk.