User blog comment:Fairy56/Why?/@comment-3237624-20170103035118

It's called (at least I think) character archtype, or maybe just color coding. They try to match colors with the personality they think suits it and its a gimmick thats worked for several years.

I admit, I do wish there was variety. But I've come to accept it and I try to see each character for who she really is, rather than a cliche thats repeatedly used.