Here is the soundtrack. It could be what matches your char or a song you heard
Arthour
Date: 2013-12-24 15:14 EST
Bon Jovi's 'Living on a Prayer' I think describes a hell of a lot of characters in RDI (Well, the title does anyways XD)
Zynisch Lucis
Date: 2016-09-07 20:35 EST
I think the closest thing Zyn has to a proper theme song is "Fukai Mori" by Do As Infinity. I've considered others, but they're too morose and less introspective.