I'd say my favorite VGM composer, at least right now, is Daisuke Ishiwatari
YES! Daisuke is an amazing composer. I love the Guilty Series as a competitive fighting game, and for it's art and music. One of my favorite game series of all time.
I really loved the #Reload soundtrack too, which was done by the Korean band N.ex.T.
I don't remember the name of the album, but it was comprised of redone tracks from old games, and it included ABAs track for when they released Slash. I the album on my laptop, but have since lost it. =( I need to find it again. That had some of the best Guilty Gear music on there.
I have some other favorite composers for RPGs, but I can't recall their names at the moment. I'll re-post later.