I got two, for Guts and Griffith. For Guts, the song "Scars" by Paparoach. And for Griffith, the song "The Show Must Go On" by Queen. Just give them a listen, and you'll totally agree with me.
I totally agree with Halle Berry and Leo DiCaprio. Those were my picks, as well. As for Guts... I think I know someone who would fit the bill pretty damn well. His name is Aiden Turner. Google him if you're curious.