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They're like a shadowguy, but the figurine their light world counterpart is, is more dog shaped n got covered in glitter (maybe even said glitter is stuck permenantly w glue or so)
I don't know how music stuff usually works but think maybe they help coordinates songs played or help compose songs for segments
The fits are cuz I imagine they're more of gender fluid rather than nonbinary (as most of my fellas tend to be) and so they wear whichever feels more comfortable atm