What I like most about the MOTHER mythos is how much of it is left ambiguous and unexplained, leaving a rich ground for theories and different interpretations of characters to arise from the fandom which is great.
For this reason I choose Mr. Carpainter as one of my favorite characters in the MOTHER series. When he first shows up in the game I thought he'd be more important or central to the story, maybe showing up again at some point, but no. It was like they wasted a perfectly good character. Thus, I feel like that there's so much we don't know about him which leave questions for fans to answer for themselves, which always leads to great discussion and creativity. What was Mr. Carpainter's history before the cult? Why choose the color blue to represent happiness?
Also it doesn't hurt that I really enjoyed the Happy Happy segment of the game, finding the idea of a cult to be one of the more unsettling things in Earthbound because of it's real-world plausibilty, to an extent, and just the idea of being in a ominous place where everyone is secretly connected and united against you is far more disturbing than colorful aliens. Paranoi-fuel, indeed.
You'll be happy to know that Theories is once again open for business! With new prompts and everything, even!