Before becoming Jr Commissioner, Vallejo was a regular safety patroller who had a lot of rough experiences with partners as results of varying missions. Two of his known partners were Malika (who became the ruthless leader of the Red Robins) and Frank Bishop (a profiler who was dicharged from the force by Principal Folsom).
As Jr Commissioner, Vallejo is in charge of making sure that the job gets done and that the safety patrollers work within restrictions (although Fillmore usually causes him hastle by causing destruction and therefore recieving repair bills). In The Shreds Fell Like Snowflakes Vallejo was awarded his second term as Jr Commissioner by Principal Folsom.
Although calm natured most of the time, Vallejo can be quick to anger who can sometimes make rash decisions. During one point of series, Vallejo had a large addiction to cocoa and enjoys various sandwiches from vending machines around the school. Vallejo has a deep sense of care for the upholding of the school rules and wants all cases to be solved as soon as possible (especially with Principal Folsom making strict demands).
Vallejo is rarely seen during missions and does not appear to show many skills apart from leading his teams. However it can be assumed that his investigatory skills are recognised as being the best in the current Safety Patrol.
- To Mar a Stall
- Test of the Tested
- A Wurm in Our Midst
- Cry, the Beloved Mascot
- Red Robins Don't Fly
- Nappers Never Sleep
- Ingrid Third, Public Enemy #1
- Next Stop, Armageddon
- A Cold Day at X
- Masterstroke of Malevolence
- Two Wheels, Full Throttle, No Brakes
- Of Slain Kings on Checkered Fields
- A Forgotten Yesterday
- The Currency of Doubt
- The Shreds Fell Like Snowflakes
- Foes Don't Forgive
- South of Friendship, North of Honor
- Immune to All But Justice
- The Nineteenth Hole Is a Shallow Grave
- Links in a Chain of Honor
- The Unseen Reflection
- Play On, Maestro! Play On!
- Code Name: Electric Haircut,
- This Savior, a Snitch
- A Dark Score Evened
- Field Trip of the Just
- Name - Horatio Vallejo
- Occupation - Jr Commissioner of the Safety Patrol
- Accociates - Malika (former), Frank Bishop (former)
- Organisations - Safety Patrol