Gooper Blooper is a large Blooper first met in Ricco Harbor in Super Mario Sunshine. He is the second boss fought in the game. He is also a recurring antagonist in the Super Mario franchise and the Blooper King.
Gooper Blooper is encountered when Mario pulls off his tentacle in the crate. Gooper Blooper starts the battle using his tentacles to attack Mario. His weakness is to pull his snout. Gooper Blooper will get angry for squirting water at him with F.L.U.D.D or pulling his snout. Gooper Blooper also spins to wipe Mario out of his arena. It will be difficult to beat him without pulling his tentacles, so it is recommended to do so. Gooper Blooper will later spray ink after pulling his cork at Mario, so it means that he must avoid this attack. Gooper Blooper will spray more ink which will damage him, so Mario must pull his snout and finish the battle.
Gooper Blooper later appears in Noki Bay and the fifth episode of Ricco Harbor.
Super Princess Peach
Gooper Blooper later appears as the fifth boss of Super Princess Peach. Princess Peach must avoid the ink shot from its snout and then attack its tentacles. First, she must avoid it or this will launch her in the air. Like in Super Mario Sunshine, his weakness is his snout. Gooper Blooper will calm down after death. Princess Peach must pop his bubble and then his snout.
Mario Tennis Aces
Gooper Blooper is the fourth boss in the Adventure Mode, fought at Savage Sea Bay in the mission "The Sea Monster Attacks!". To defeat him, Mario must use his racquet to knock the balls of ink back at him. Gooper Blooper will also attack with his tentacles, which is telegraphed with blue lines that mark where the tentacle will land.
Paper Mario: Sticker Star
Gooper Blooper appears as a boss possessed by the Purple Royal Sticker, having polluted the waters of the forest with his poisonous ink. Due to the Royal Sticker, Gooper Blooper has poison attacks, unlike in the other games. The music will change when he changes the dancing with its tentacles. He will turn fully purple after a while. At that moment, using a Sponge Sticker will reflect the toxin Gooper Blooper shot out and poison him instead. Once defeated, his ink disperses from the water and restores it.
Paper Mario: The Origami King
Gooper Blooper was turned into a Paper Macho Soldier by King Olly. In Bob-omb's backstory, Gooper Blooper attacked the Princess Peach cruise ship while Bob-omb was on vacation and tossed overboard, losing his fuse and memories in the process.
In the present day, when Mario escorts Bob-omb to the Princess Peach to retrieve his fuse, Gooper Blooper attacks the ship after power is restored to the ship, snatching Bob-omb's lockbox from the royal suite. Bob-omb and Mario chase Gooper Blooper to the bow of the ship, where they confront him. Once Mario defeats Gooper Blooper, he bursts into confetti, dropping Bob-omb's box and all Toads consumed by him. In this game, he does not have the purple hue he had in Paper Mario: Sticker Star, instead using his traditional appearance from Super Mario Sunshine and Super Princess Peach.
Super Smash Bros.
Gooper Blooper's paper form from Paper Mario: Sticker Star appears as a trophy in Super Smash Bros. for Nintendo 3DS.