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Sir Swoop is a Swooper that fights at the Glitz Pit in Paper Mario: The Thousand-Year Door. He is a member of the Wings of Night. After a few rounds he will come into the Minor League room and Mario can talk to him. Sir Swoop enters the Glitz Pit shortly after KP Pete vanishes. He gets the exact same introduction from Jolene as Mario did (even including button prompts, such as "Press A"); however, his instructions from Grubba are comically to "do a triple flip and meow".
Sir Swoop resides in the Minor League locker room for the rest of the chapter. After the chapter has been completed, Sir Swoop will vanish because of KP Pete returning to the roster.