Adam Android heros

This is what I think will be the main characters for my comic: Mario(as a teenager), Buttercup, Adam Android, Bloo, and Phil. I need help in two ways though. One is to help suggest better suited characters for the heroes and another is that I need better coloring systems(this is in MS paint and it sucks.). Either help me find a system good for coloring comics and it's price or maybe someone could even help me color it.Thank-you.