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King Bob-omb (or previously Big Bob-omb) is a giant Bob-omb who rules all Bob-ombs, as well as appearing as the first boss in Super Mario 64. He lives on the top of a giant mountain in the middle of the Bob-omb Battlefield.
His first real appearence in SMG4's bloopers was in the episode Super Mario 64 Bloopers: Mission For Peach where he attacked Mario for stealing his coins. He appeared again in Super Mario 64 Bloopers: Mini Italians where he guarded a mushroom and attempted to stop the shrunken italians. His biggest appearence was in the sob story: Sob Story: Tale of a Bob-omb where he fell in love with a Bob-omb that escaped the factory. At the end he was killed by Mario. He appeared much later in Super Mario 64 Bloopers: Super Mario Attorney where SMG4 helps him fly, but ended up plummeting and exploding onto the ground.
After a long absence, Big Bob-omb returns on a normal blooper, SM64 Bloopers: Casino, Cards and Chaos where he is named King Bob-omb and is one of the two main antagonists along with a Whomp. In this blooper, he appears in the casino and since Luigi was winning so many times, Big Bob-omb drugs him and Mario comes up with a plan where he must replace the casino's dealer. After succeeding, Mario says that Luigi wins 15 billion coins for not doing anything. This makes the Whomp and Big Bob-omb mad, so Mario and Luigi try to hide. After the Whomp got stomped by Dr. Eggman and Big Bob-omb got fooled by Mario, Big Bob-omb is defeated with the many coins from the slots. It is unknown what happened to Big Bob-omb after the Mario bros. leave the casino, as there was an explosion. In SMG4: Mario The Supreme Leader, Mario orders the Toad soldiers to take down the rest of SMG4's Gang, promising the soldiers they can gain control of Bob-Omb Battlefield if they succeed, much to King Bob-Omb's chagrin.