Let's say I have 2 different characters and no matter which one is picked I need him to change colors (for example red to green) whilst playing, whether it is a circle or a square. How can I do that?
You can use an action that changes the animation for another and that lasts many time. That other animation in the action is the one that must reproduce the personage with the color that you want.
Maybe this helps: He is using actions to change the color of the character. You could also set the opacity of the action item to 0%.