Ramble On always made me think of Letho. Blend of rock and fantasy reference, I suppose.
Any electronic synth style music reminds me of Madison, since Andy introduced it to me.
Closer by NiN gives me a Lye vibe, since his character is both sadistic and screws everything in sight.
Anvil of Crom off the "Conan the Barbarian" soundtrack screams Breaker to me. Song kicks ass, makes me think of H2H combat.
Cyan's Theme makes me think of Shinsou. Sort of a Japanese vibe with some real heraldry to it. Dramatic without being over the top.
Super Metroid Theme gives me a Philomel vibe. Equal parts spooky and heroic, alien and sexy, dangerous and optimistic. Plus, there's an obvious femme fatale vibe. I love this goddamned theme.

Out of time, but I'll do more at a later date. Open for requests!