Gooper Blooper is a giant Blooper with large and longer tentacles. He first appears as a boss in Super Mario Sunshine, where he appears in the levels Ricco Harbor and Noki Bay. He uses his tentacles to smack Mario, draining his health. After his debut in Super Mario Sunshine and reappearance in Super Princess Peach, Gooper Blooper's role was shifted to that of a recurring boss in sports games and other spin-offs.
(The above text is from the Super Mario Wiki and is available under a Creative Commons license. Attribution must be provided through a list of authors or a link back to the original article. Source: https://www.mariowiki.com/Gooper_Blooper)