Strangely when I'm writing this one medieval, English/nordic style character I listen to Drapht (An Aussie rapper) and that works for me. Other times I use music to think of fight scenes I use The Chats for any sort of edgy/fun fights. Doom music, Disco, Biggie smalls, Eminem, Tupac, Wu-Tang Clan, Gangsters Paradise, Blues Brothers, Joan Jett, ACDC, K.Flay for edgier characters. So a bit of everything. Except mumble rap fuck off with that shit.
Oh and if it's an ass that needs kicking, a skull that needs cracking or an idiot who needs to learn the hard way, Queen Fat Bottomed Girls. I've had badass moments irl when that song played. First time was a party this year, so this guy who was uninvited was shoving this girl I knew against a fence when she was trying to leave, I picked up a bottle of vodka, took a swig, tapped him on the shoulder and spat it in his face and then held my lighter up to his face. He left the party…
The second time was a fight and I had a sledgehammer… I had the song playing on my wireless speaker, I was using the sledgehammer when my neighbour (total asshole) decided to go off at me, I flashed the sledge hoping he would just leave… but he punched me so I broke his foot with it.
All in all, every time that song plays I feel like a badass so it helps my writing.