Look up video game music archive on any search, and you'll find a site that has tons of midis. Perhaps it's over there.
Anyway, for "Sons of Satan", yeah, I'd like something orchestral and epic. But perhaps an arrangement like "Nightmare" wouldn't be a bad idea either.
As for Sophia's theme, I'd say it should sound similar to Simon's theme, or the Belmont theme, which ever you prefer. It should sound soft and gentle, while still strong and adventureous. The Genere would be action packed. Like say for most of the song it sounds like standard Belmont fare, but some parts of it go into a sort of relaxed phase. Like say in the music where you're fighting Richter in Symphony of the Night, there are some portions where it goes into this phase where it kinda makes you feel bad for fighting him.