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Professor Prepostera is a horse NPC Toon who is part of Loony Labs along with Professor Flake, Doctor Dimm, and Doctor Surlee. He, along with Doctor Dimm, hasn't had any speaking roles in Toontown Rewritten, besides his blog post about The Gray. He, along with Doctor Dimm, made a small cameo during the Toon Council Presidential Elections inspecting Slappy's campaign stand.
- He was the leader of Loony Labs and the scientist in the spotlight in Toontown Online. This position was taken by Doctor Surlee in Toontown Rewritten.