Thinking more about the joke theory of 'Pizzapants is Mike' makes me want it to be true so fucking bad. There's just enough to line it up that it could actually work.
Mainly want it to be true because imagine you have this mysterious stranger who's influencing everything in the fantasy adventure worlds you're going through, treated like a weird force of knowledge and influence, with people both in and out of game going nuts trying to figure out who/what he actually is and...
It's the fucking 20 year old that works at the pizzeria down the street and gives unsolicited advice to his much more successful friend's sibling.
It perfectly fits Pizzapants to be the guy that gives others advice on how to be successful despite being a 'failure' himself.