Here's a fun little thing to do, it may even flesh out your character! This is a music survey, themes for your characters to groove to. Be sure to list song name and musician, maybe even a highlight lyric or two.
General Theme (This is what should play all the time.)
Instrumental Theme (Just let the music play, no words.)
Silly Theme (Hijinx and comradery, ahoy.)
Entrance Theme (For when you walk into the room.)
On the Chase Theme (When you're chasing down the bad guy, or are the bad guy.)