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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. It sports a fez, a cape and two yo-yos, 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. Yo Bros. occasionally accompany Laser Snifits in battle.
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