Thor

He is a true member of GREMLIN, and once was its representative combat member. His first appearance has him recruit Touma to save Fräulein Kreutune in order for her not to get involved with the fighting that GREMLIN and Ollerus' group would come to do. He is described as a thin white-skinned boy with a feminine look to him. He's dressed in primarily yellow and black. He wears a tight-fitting shirt and pants as well as a dark stole around his shoulders. He has blue eyes and blond hair tied in a long ponytail. (Source: Toaru Majutsu no Index Wiki)