Why big piano? The name is a juxtaposition. Big (big) Piano ('soft', in music theory). so basically Big Small. they/them not because they're nonbinary but because they're literally multiple colony organisms. They're kinda like if the soot sprites from spirited away worked together to make 1 anthropomorphic thing. In terms of personality, they are incredibly powerful but unaware of it. probably has some sort of undiagnosed adhd or something. very impulsive