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The Yo Bro is a Hammer Bro variant encountered at Woohoo Hooniversity in Mario & Luigi: Superstar Saga. Its name and appearance reference hip-hop culture, with "yo" and "bro" being commonly used words among hip-hop-oriented youths, and wearing baggy clothing common among these youths as well, and the name is also a pun on "yo-yo" and Hammer Bro. It sports a fez with a small plant on the front, and two yo-yos based on Koopa Shells, one red and one green. Whichever yo-yo it spins will indicate whether it attacks Mario or Luigi. It has a charge-up ability that lets it deal more damage, and can also feint an attack, which is indicated when the "spinning" sound is not heard. Like other Koopa-like enemies in the game, Yo Bros. are healed by fire, though they are weak to thunder. Yo Bros. occasionally accompany Laser Snifits in battle. However, Yo Bros aren't fought anywhere in Woohoo Hooniversity's basement.
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