Gremmy is a Quincy and has a child-like appearance with messy blonde hair, he wears a typical Sternritter uniform consisting a loose trench coat with a hood and a high collar. Gremmy is incredibly proud and confident in his own powers and believes that imagination is the strongest force in the entire world. He can be cruel sometimes and having no mercy to his own opponents, however he is sometimes friendly and polite. He is also quite arrogant believing that himself is the strongest Sternritter.