King Hippo is a very strong and large boxer in the Punch-Out!! series. He has a very large appetite and eats many fruits native to the Hippo Islands, from which he hails from. His over-eating has caused him to have a very weak gut, so body shots are usually the prime source of damaging him. Not much else is known about him, except that he holds the Minor Circuit belt and once he is knocked-down, King Hippo will not get up. He speaks a unknown language and retains the minor circuit belt for Punch-Out!: VR.
King Hippo wears a silver crown, pink boxing gloves, orange trunks with a red waistband and white stripes down the sides, and brown slippers. He is very large and wide, and has an "x"-bandaged belly.