As both Loki's guardian and a fugitive who lives in the Forbidden Forest, he goes by the alias "Joker" and is neither a member of the Red or Black army. He holds magical power equivalent to that of Lancelot's. Despite his elusive manners, rumours have spread that he's planning a revolution of his own.

Harr's most distinguishable feature is the silver-plated eye patch he wears over his left eye. His uncovered eye appears to be of a dark brown colour while his tousled hair is black in colour.