why do we assign theme songs to our characters??

i mean...i get it from a show or a video game standpoint, but aside from that...why???

i find it so incredibly hard to place a theme song for some of my characters that all i'd get is a battle theme, or a scenario theme.

(try The Red [Chevelle] for a battle vs Sonus or I Get It [Chevelle] for any argument between aforementioned boi and his ma.)

i can never find a song that fits an oc as a whole. i know i said that my teamrocket!ash's theme song was mars from the planets. i know. but that's not an oc, that's an au.

just a bland rant that gets me nowhere.