Why don't you try to make a Skin of ACS first? Also, if this is your first attempt on spriting...well, everybody starts somewhere, right? Try to improve it making more fluid animations and a bit of shading here and there. I won't lie to you. The sprites are REALLY simple, and there's virtually no chance of it getting into SMBC, either as a Skin or a separate Character. But it's not like you can't improve on it. But really, try making a skin based on it first, even if it's just for learning how to sprite better.