Ernesto may in fact be real but his existence may be multi-dimension and unstable to where only Petey and Loris can interact with him..oh and Viola (I think that was her name). Once Petey touched the card, he caused it to solidify in the “real” world.
Mark is neither…he’s the needed balance to their insanity, he’s filling the holes that the ex left behind… Mark should be permanent ::)