Lotte's playlist was started sometime in December and just...grows exponentially each day. It's scary. Most of it is Christian music (irony on hearing things and trusting the unseen and so on), Musicals, and 80's pop. There's a scary amount of Elisa, Emilie Autumn, and Andrew Lloyd Webber on the list though. The latter makes her way pout.
Luther is one of those rare characters of mine that does alright with silence. However, I tend to grab the Les Mis songs that have him in it, action soundtracks (The Lights, Motors, Action theme from the show of the same name at WDW is extremely Luther.), and the stray Alternative song.
Joss was mainly inspired by listening to Telephone by Lady Gaga on repeat. With some Dance in the Dark and Monster thrown in. I tend to listen to mainstream things for her, as they tend to fit her - though I find it amusing "The Fear" by Lily Allen describes her best.
Xavier has a playlist that's growing at a rate that's competition to Lotte's. O_O The Count of Monte Cristo musical soundtrack and 30 Seconds to Mars are the usual things. The Dave Matthews Band, Police, and U2 also are fitting >_> As is the stray Fall Out Boy and Panic at the Disco song.
Sheila's music is really what she listens to - things that have very tribal beats or are Disney related. Phil Collin's music for Brother Bear and Tarzan, Elton John's music for Aida and The Lion King, djembe drumming, and STOMP are what's usually fitting.