Gekka is an older man with grey, neck-length, hair and a grey beard. His usual attire is a black business suit and a white dress shirt, with a yellow tie. His irises are also red. Due to his injury, Gekka is usually seen being in a motorized wheelchair. According to Yui, he looks handsome. Befitting a detective and former police officer of his status, Gekka is a serious, charismatic and highly intelligent individual who does have a strong sense of justice.