Booster was a minor antagonist in the game Mario RPG: Legend of the 7 Stars. He kidnaps Princess Peach and, while childish, fought Mario and his friends (including Bowser, who just wanted to kidnap back Peach). In the end of the game, he winds up marrying Valentina.
- He seems to be only one Booster of many in his family, the eleventh to be exact.
- He shares a resemblance to Wario