My influences range and change a lot so it's hard to target one of them as I'll start writing something, then shift into a different musical gear as soon as I get halfway through something haha.
But some well know musicians that I get inspired by are people like..
Danny Elfman,
Jun Senoue,
Koji Kondo,
Michael Jackson,
Harry Gregson-Williams,
Grant Kirkhope
..And a bunch of others I could reel off. A lot of the styles by these guys differ too so I'm never really in one state of mind when it comes to writing music for games and I like to fuse ideas most of the time to see what works.
I'm the same way when I write, somehow I will end up changing the whole feeling of the beginning song into something else... oddly enough, Mumford and Sons really inspire me as well, haha.