Souji Kusakabe, known as Kamen Rider Dark Kabuto, is a character from the tokusatsu series Kamen Rider Kabuto. He is the darker counterpart of the main protagonist, Souji Tendou. Dark Kabuto possesses similar powers to Kabuto, but his motives and personality are more mysterious and antagonistic. He plays a significant role as both a rival and mirror to the hero, challenging Tendou in combat and ideology, and representing the theme of duality within the series.