Adobe Illustrator - Making changes to multiple objects at once?

So I do animations for my games in illustrator. The problem is, if I want to make a change to a character, I have to change every single frame. Is there a way that I can duplicate an object, (for example, a simple circle object) and then every time I change one circle's color, the other one changes along with... show more So I do animations for my games in illustrator. The problem is, if I want to make a change to a character, I have to change every single frame. Is there a way that I can duplicate an object, (for example, a simple circle object) and then every time I change one circle's color, the other one changes along with it?

It's a complex function, but it would really help me a lot if it exists.
Update: Symbols just makes copies of something. As far as i know, those copies, once placed, can't be edited in unison.
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