Principal Gurniel is the big kahuna of Del Toro High School. He presents a laid-back attitude and his speech habits hint at a background as a surfer when he refers to the students as "grunions" in "Tech Rehab". He also involves meditation candles in resolving disputes in "The D-List".
But when Ms. Teets arrives with her long-lost love Duncan at the school junior prom in "Red Tuxedo", he spots Mila Kunis drinking and places her under arrest, leaving Ms. Teets for his job and leaving her to console herself sexually with Gurniel.
Principal Gurniel is voiced by Alan Tudyk.