Mikami is a young man with shoulder-length black hair, who wears glasses. His typical attire consists of a black trench coat over a business suit. Like many of the characters, he can be perceived as attractive. Throughout most of the series, he was drawn to be kempt and similar in design to Taro Kagami, the main character in the pilot chapter of the series. When he finally sees Light, he becomes disheveled and looks more like an "insane fanatic" of Kira. In some instances,