Southern Supreme Kai (南の界王神 Minami no Kaiôshin) is a bulky, powerful Supreme Kai that resided in Other World. Being the most powerful of all the Supreme Kais during Kid Buu's attack, Southern Supreme Kai put up a good fight but was eventually absorbed into Buu and turned into "Buff Buu". They fought in a rocky place near watery lakes. It is assumed that he still lives - along with Grand Supreme Kai - in Fat Buu's body.

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