Harrison Harris Yates
| Gender | Male |
| Age | 45-50 |
| Hair Color | Orange |
| Occupation | Police Sergeant |
| Grade | 4th Grade |
| Aliases | Mysterion, El Pollo Loco |
| Religion | Roman Catholic , Temporary: Blaintologist |
| Wife | Maggie Yates |
| Voiced by | Trey Parker |
| First Appearance | Christian Rock Hard |
Sergeant Harrison Yates is the lead detective of the Park County Police Force and as far as we know, the highest-ranked police officer in Park County. He is usually accompanied by his partner Mitch Murphy or generic police officers.
He first appeared as a member of the FBI, but has since been seen as part of the Park County Police, a role he has consistently kept in the series since then.