A guy on GameFAQs once posted this picture in passing and I saved it, 'cause let's face it: it's a drag to figure out what Stellazzios you're missing if y'haven't been keeping track. At least none of the coins are permanently missable. The pic's kinda blurry but beggars can't be choosers!

As for the friendly creature thing, they'll reappear if you attack/defear them, so you can't accidentally paint yourself into a corner.