King Hippo is one of Little Mac's opponents in the Punch-Out!! series. In Mike Tyson's Punch-Out!!, King Hippo was the second opponent in the major circuit for Little Mac. He wore a little crown and large pants because of his giant weight. When down, Hippo won't get up for another go. In Punch-Out!! on the wii, King Hippo was much more of a challenge than he was on the NES. He had a double hook attack. In Title Defense, he applied a manhole to his stomach. If Little Mac beats him, the hippo falls out of the ring.
Role in Super Smash Sisters
King Hippo is a non-playable character in Super Smash Sisters. Like in the Wii Punch-Out!!, he speaks in beastial growls and roars.Even when helping out, his pants still fall down. He is sometimes seen together with Amy Rose as comic relief.