Kankichi is Eikichi Mishina's father and the owner and chef of the Gatten Sushi restaurant. He is rough and loud. He is said to be skilled in 18 kinds of martial arts like judo, karate and capoeira. In truth, Kankichi doesn't know any of those and fabricated the rumor himself in order to intimidate Eikichi. Eikichi, in turn, believes the rumor and always fears his father to the point that Eikichi dares not wear his make up until away from his dad.
"Motto is "Heart, brains, and prawn." Wants Eikichi to follow in his footsteps. Rumored to be skilled at multiple martial arts..."
—His introduction, Persona 2: Innocent Sin
The first time the player visits Gatten Sushi, an event will occur where Kankichi scolds his son for dressing like a weirdo and urges him to inherit the restaurant. Lisa finds it amusing that the boss of the high school has such a weak spot for his parent.
While advancing inside Xibalba, where thoughts become reality, a metallic Kankichi emerges from Eikichi's fear for his father and challenges the player in a boss battle. After the fight, Eikichi bluffs and claims he's overcome his patriphobia, while the rest just shrugs. A shadow Kankichi in leather/rubber tights forms the right leg of the Great Father and shouts "Do as I say!" at Eikichi while attacking. Its signature move "Master 18" directly refers to the rumor of his martial arts capability.