He's an actual mole in the series, from the race that hasn't fully evolved into mole people yet. That being said, he's sort of Simon's optimistic counterpart, and is consistently the voice of reason throughout the show. He doesn't know why he get's wrapped in these crazy shenanigans, but he does. This voice can either be done with a modifier (without sounding TOO high pitched) or in a chibi-ish way, but without sounding overly so!