Cast 41
Millie Davis
Ms. O (153 episodes)
Dalila Bela
Agent Olive (153 episodes)
Isaac Kragten
Otis (153 episodes)
Christian Distefano
Owen (153 episodes)
Filip Geljo
Agent Otto (153 episodes)
Anna Cathcart
Agent Olympia (153 episodes)
Sean Michael Kyer
Agent Oscar (153 episodes)
Eshaan Buadwal
Olaf (153 episodes)
Olivia Presti
Oona (63 episodes)
Jaiden Cannatelli
Olhm (15 episodes)
Jaeden Noel
Agent Obfusco (7 episodes)
Kyle Gatehouse
Monsieur Papier-Maché (6 episodes)
Martin Roach
Fladam (4 episodes)
Drew Haytaoglu
Ozric (3 episodes)
Percy Hynes White
Odie (3 episodes)
Matt Folliott
William Ocean (3 episodes)
Ellery Miki-Petite
Arctic Mr. O (2 episodes)
Sharron Matthews
Chef Sylvia (2 episodes)
Ella Bernstein
OSIP (1 episode)Lift Operator 1 (1 episode)
Tomaso Sanelli
Agent Ogg (1 episode)
Raphael Alejandro
Agent in Band (uncredited) (1 episode)
Miguel Anthony
Tony (1 episode)
Alexander Elliot
Agent O'Que (1 episode)
Kyle Meagher
Not The Real Big O (1 episode)
Jacob Soley
Osmond (1 episode)
Sarah Abbott
Yucks (1 episode)
Logan Aultman
Seattle Creature Agent (1 episode)
Fodé Bangoura
Dad (1 episode)
Aaron Eves
High Five (1 episode)
Tyler Malazo
Evil Newsboy (1 episode)
Thom Allison
Chef (1 episode)
Kevin Hanchard
Dry Cleaner Guy (1 episode)
Jameson Kraemer
King Pin Mike (1 episode)
Mercedes Morris
Corn Flakes (1 episode)
Ann Pirvu
Evil Queen (1 episode)
Ana Araújo
Chief of Graph (1 episode)
Amrit Kaur
Annette (1 episode)
Ava Arrindell
New York Ms. O (1 episode)
Krista Patton
Mail Carrier (1 episode)
Brendan Halloran
News Anchor (1 episode)
Crew 1
Jessie Saunders-Drutz
Post Production Assistant (35 episodes)