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Borio is a fanon infamous third mario brother. He wears a blue cap and green overalls, as seen to the right.
Borio's only appearance in a mario kart game is Mario Kart Super Raceway as an unlockable Character by getting a star in every mirror mode cups, get a 325 star rank or just buying him in the shop.
Though fanon, he is not similar to another fanon third bro from Fantendo, Gasparo.