- See also: Category:Professor Prepostera
Professor Prepostera is a horse NPC Toon who is a member of Loony Labs and is part of the S.I.L.L.I (Scientists Interested in Laugh Levels Increasing) Team along with Doctor Surlee, Professor Flake, and Doctor Dimm.
Besides his blog posts about his research on The Grey, he also made a small cameo during the Toon Council Presidential Elections inspecting Slappy's jellybean stand, made another appearance at the Toontown Central Pet Shop during April Toons Week, and made yet another appearance on Silly Street to offer a new ToonTask.
- Professor Prepostera was the leader of Loony Labs and the scientist spotlight in Toontown Online. The Toontown Rewritten Team decided to give this position to Doctor Surlee in order to provide a story about why he never smiles.