The IC glitch decided Zeb wanted to play, so he gets an instrument too, and you aren't stopping ME
His profile mentions that he's a quiet guy unless provoked. I think that a trumpet would fit! It's capable of doing both, but I think that, as a default, he would be a mezzo piano (meaning that his voice is soft, but not too quiet)!
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Details about Aiden's vocals are at the very bottom of his written profile! Though, if you want, you can base it on his personality as well