Popularity: 9
| Creator: | Tim McKeon, Adam Peltzman | 
|---|
| Name | Character | Episodes | 
|---|---|---|
| Anna Cathcart | Agent Olympia | 153 | 
| Millie Davis | Ms. O | 153 | 
| Dalila Bela | Agent Olive | 153 | 
| Sean Michael Kyer | Agent Oscar | 153 | 
| Isaac Kragten | Otis | 153 | 
| Filip Geljo | Agent Otto | 153 | 
| Olivia Presti | Oona | 63 | 
| Jaiden Cannatelli | Olhm | 15 | 
| Jaeden Noel | Agent Obfusco | 7 | 
| Kyle Gatehouse | Monsieur Papier-Maché | 6 | 
| Martin Roach | Fladam | 4 | 
| Percy Hynes White | Odie | 3 | 
| Drew Haytaoglu | Ozric | 3 | 
| Sharron Matthews | Chef Sylvia | 2 | 
| Kevin Hanchard | Dry Cleaner Guy | 1 | 
| Raphael Alejandro | Agent in Band (uncredited) | 1 | 
| Kyle Meagher | Not The Real Big O | 1 | 
| Amrit Kaur | Annette | 1 | 
| Tomaso Sanelli | Agent Ogg | 1 | 
| Mercedes Morris | Corn Flakes | 1 | 
| Alexander Elliot | Agent O'Que | 1 | 
| Ana Araújo | Chief of Graph | 1 | 
| Jacob Soley | Osmond | 1 | 
| Thom Allison | Chef | 1 | 
| Jameson Kraemer | King Pin Mike | 1 | 
| Marcia Bennett | Circle Lady | 1 | 
| Ann Pirvu | Evil Queen | 1 |