Bucky (BBuck) is the younger teenage brother of BB who first appears in "BB’s Bro". He visits BB's home unannounced and says he's staying with her as he's fed up of their parents bossing him around. She reluctantly allows him to stay after a phone call to their parents who want a break.
Bucky argues with BB and creates a mess at the dinner they always go to. He is a big fan of Mantyz's who he claims he modelled his own music after. They manipulate him into stealing the power chip in BB's mic that was filled with 13th note energy.
He wants to be a big musician, though it is never mentioned what instrument he plays or if he's a singer or what he does since we never hear any of his music.