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Sergeant Guy is a Green Shy Guy that carries a silver pipe and Magikoopa's wand on his back. He is a minion of Bowser in Mario & Luigi: Bowser's Inside Story and Mario & Luigi: Dream Team, serving as a protagonist in the former and an antagonist in the latter.
Mario & Luigi: Bowser's Inside Story
He is first seen with Corporal Paraplonk and Private Goomp attempting to take Bowser's Castle back from Fawful with a Banzai Bill Cannon. However, the minions have no ammo and Bowser is forced to go inside and get some ammo. Once Bowser obtains the Banzai Bill, the three minions fire it into the castle.
Later on, in the Treasure Chamber in Bowser's Castle, Sergeant Guy and his companions watch Bowser defeat the Fawful Express and once Bowser opens the safe, Sergeant Guy and the other minions push Bowser into the safe, stating that Fawful bribed them with rations.
Sergeant Guy was seen after the closing credits, where he and the other minions apologize for their treason, and ask Bowser if they could rejoin the Koopa Troop. Bowser then orders them to get involved in the repairs of his castle like his other minions, indicating that they have been accepted back in.
Mario & Luigi: Dream Team
In Mario & Luigi: Dream Team it is revealed that Sergeant Guy was promoted along with his associates to Bowser's Royal Guard. He has a flag with a Bowser emblem on it. In contrast to the previous game, he is an antagonist instead of a protagonist, due to Bowser no longer being one of the protagonists as was the case in Bowser's Inside Story. He travels with Bowser to Pi'illo Island to find Princess Peach. Sergeant Guy also helps Kamek disguise as Princess Peach forming a lower section of the disguise. It is also shown that he and his associates dream of bossing around Kamek & Bowser one day. The trio are also fought in a boss battle as the Elite Trio.
After being defeated, Kamek demotes them to janitors and sends them back to the castle. After Bowser was defeated, he, Kamek, Private Goomp, Sergeant Guy and Corporal Paraplonk decided to retreat. Although Bowser was really mad that his plan had failed and that it was Antasma's fault, he told his three minions that they did pretty well by their usual standards, much to their joy.
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