Captain Koopa Troopa
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Captain Koopa Troopa is one of the main protagonists of the Minion Quest: The Search for Bowser story mode from Mario & Luigi: Superstar Saga + Bowser's Minions. His main personality quirk is his tendency to speak in rhymes. Other characters are often annoyed by his rhymes, typically resulting in a drawn-out silence with nothing but wind sounding; Fawful, however, is vocal about how bad he finds them, calling them "unspecial and full of cringe." Captain Goomba, on the other hand, is encouraging of them in many cases.
Captain Koopa Troopa first encounters Captain Goomba, Captain Shy Guy, and Captain Boo in Teehee Valley. Out of boredom and loneliness, he joins the Goomba Squad, even accepting the offer to join as a captain without question. He suggests to the Captains to ask Popple where Bowser went without fighting him. The asking works, however Popple still fights the Goomba Squad regardless as payback for Chucklehuck Woods, but they win regardless. While Fawful taunts the squad about Bowser no longer here in this world, he cruelly insults Captain Koopa Troopa's rhymes before the squad heads off to Joke's End to find and repair the Koopa Cruiser. He rhymes with some Buzzy Beetles who were donating their shells to repair the Cruiser, and nearly causes them to leave with their shells. Before the Goomba Squad raids Bowser's Castle, he tries to tell Captain Goomba to remember that Bowser was no longer there, only to get pelted by a Turnip from Captain Shy Guy.
Captain Koopa Troopa appears in Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey, where he is an enemy in the Bowser Jr.'s Journey mode. He fights alongside Captain Goomba, Captain Shy Guy, Captain Boo, and King Bob-omb. During this time, he also gave up rhyming for jokes, only for his attempted joke involving wordplay between Bowser's name and telling a waiter to bow to fall flat.