I'm not sure, allthough it's probably a reference about how actors Jean Paul Belmondo and/or Marlon Brando turned from dashing young guys into fat blobs as they got older (well, Brando certainly did, not sure about Belmondo but UR tries to reference at least 2 things at once if possible).
I think he's human or very humanoid alien at first, but then is transformed to greenish blob. That's what I understood from the bio at least.
He was a human or humanoid alien first. He ordered bzz bzzz for Mantiz, but instead got bzzz bzz. Coming in contact with bzzz bzz turned him into the monster in his final level.