I don't really have any specific vision for Marco, so come up with whatever you think fits his appearance/personality!

I would also like a fairly experienced voice actor to take his role because it will require a bit of yelling and intense emotion.

Marco is a half human/half cat hybrid with the mental capacity of a cat and the physical capabilities of a human, the comic relief but not as dopey as say Homer Simpson or Patrick Star. Marco is just more of a make decisions first as questions later sort of guy...I mean cat.