I thought I'd give this a go, even though it's something I tend to stay away from. I figured it would be good to do it from the perspective of what Elliot/Ellie would hear in their heads as they went about things, as they both see the world quite differently to how it actually is. Ellie especially loves her music, 80's pop is constantly playing on her ipod.
Elliot's Theme (or, atleast what he hears in his head. Blaze already pointed out he's nowhere near bad-ass enough for such a theme, but I can soo picture him imaging this as he wanders around, looking at everything through narrowed eyes!)
What's going on inside Elliot's head when walking to work (He works with Julia)
Elliot's Battle Theme Elliot is a huge fan of comic book super heroes, as well as rock music. This would totally be going through his head when he gets himself into a fight he's deluded himself into thinking he can win.
Elliot has a job working for Raleigh, for which he's turned into a cat girl. He can end up in all kinds of outfits, but the standard is a sailor fuku. While he IS very embarrassed about it all, he still finds himself singing and dancing to
this in his head.
Ellie's general daydreaming themeEllie's Battle Theme This is typical of what's going through her head when casually carrying out contract killings.
Ellie's Victory Theme Yeah, she pictures the dancers too.