Okay, I don't so much have playlists for my characters... instead, they have their own Pandora stations. Because I'm that much of a dork.
Even though it's really not at all what she listens to (which, to be honest, is just whatever is on the radio), for Sherri I have a Pandora station that's mostly... yeah I'm not really sure how to describe it. 90s rock? The song that's the basis for that station is Barenaked Ladies' "What A Good Boy."
Theo has a station that's honestly what I listen to a lot of the time anyway; lots of They Might Be Giants, Modest Mouse, Oingo Boingo, and if Pandora had more of it there'd probably be a tiny bit of nerdcore thrown in, even if only ZeaLouS1's "Battle Stance" for the beat.
Actually, Moana doesn't have a station, because the kind of music that I'd use for her actually puts me to sleep. If I created one, there'd be lots of ambiance music - ocean sounds, soothing instrumentals. She'd probably enjoy Sheila's more tribal and djembe drumming music blasting, though, if only she lived low enough in the building to hear it.