北斗神拳
is a self-proclaimed genius who has developed a self-styled imitation of Hokuto Shinken by observing Toki's treatment of patients in Miracle Village. He bears a grudge against Toki after being scolded for mistreating a patient and when the real Toki vanishes, Amiba decides to tarnish his reputation by impersonating him (by changing his facial appearance and reproducing the scar on his back) and using captive human test subjects for his sadistic pressure point experiments. Kenshiro confronts Amiba, believing that he is the real Toki who has turned evil, until Rei (having trained with Amiba in the "Nanto Seiken" school) arrives at the last moment and exposes his true identity. Amiba was voiced by Takaya Hashi in the original TV series.