I tend to do that myself. I started with my favorites (Klavier, Trucy, Edgeworth) then moved on to other characters I liked (Max, Godot, Ema) and managed to fill it with them for the most part. If I needed a sprite I would have gone to Mia or Maya, but I didn't.

The sprites are some of the most interesting things about the Phoenix Wright games IMO.

Court-Records is a great PW fansite. I use it for practically everything.