I just listen to whatever! Sometimes just TV in the background. lololol. I don't have playlists for my characters, although I do sometimes associate songs with them.
I don't know about misconceptions per se, but it's hard to get across some things. Like, Flynn is incredibly charismatic and good-looking, and canonically it's stated that people ignore Yuri and fall all over Flynn when he's around, but in game I can't make people react the same way, or think that Flynn is more beautiful than anyone else. Orihime and Lelouch are also beautiful by their canons. I also have a hard time getting people to react to Allen as if he's... you know. Scarred with an exoskeletal arm. In tags people tend to just ignore that or take it in stride if they notice it at all.
And sometimes people exaggerate characters based on their preconceptions. Like Orihime is frequently silly = Orihime is never serious, is stupid, couldn't possibly get along with my srs bizns character, so why have CR with her. Or Lelouch occasionally does bad things = Lelouch is cartoonishly evil and my character can smell him being evil from a mile away and so my character will be wary of him no matter how you play him. That part is a little frustrating, but it never results in too much of a problem and it hasn't happened recently, so. /yay