It's the low sanity that really makes me not want to use him (beyond the whole thematic thing).
Fact is, against Cthulhu, this guy really, really, REALLY would be a burden. I mean, everything else looks fine, completely, and sure using Clue tokens to mitigate Sanity loss is a sure thing BUT, think about it; he can never seal gates in a game with Cthulhu or Yibb-Tstll. And while I do understand wanting to make an Investigator based around a favorite character from a favorite show, you're effectively never going to want to play as this guy after maybe one game simply because that Sanity stat is so restrictive it will likely lead to a miserable experience for all parties involved.