Characters
Every character indexed in a story, from headliners to one-panel walk-ons.
- Kelly O'Hare — Cutey Bunny
- Med-Judge O'Hare
- Tulip O'Hare
- Tulip O'Hare
- Lafayette O'Hearn — Astro City
- Sergius O'Hoolihan — Marvel
- O'Jeneus — DC, the second Gizmo
- Mikron O'Jeneus — DC, Gizmo
- Jack O'Justice
- Butch O'Keefe — of the Death Patrol
- Mary Elizabeth O'Koren
- Mary Elizabeth O'Koren
- William David O'Koren
- William David O'Koren
- Officer O'Krime — Marvel Golden Age hero
- Maximillian O'Leary — Sargon the Sorcerer's sidekick
- Sergeant O'Malley of the Red Coat Patrol — DC
- Brandon O'Malley — Talon
- Inspector J. J. O'Malley — Charlton; of the Racket Squad
- James O'Malley — Talon
- Mr. O'Malley
- Nathaniel O'Malley — Talon
- Piguel O'Malley — Marvel, Spider-Ham 2099, Terre-93726
- Piguel O'Malley — Marvel, Spider-Ham 2099, Earth-93726
- Alfie O'Meagan — typically from Earth-8908
- Kathleen O'Meara — Damage Control, Marvel
- Shan O'Meara — Earth-691
- Detective Ryan O'Mega — Noble Causes
- Max O'Millions — Astro City
- Shebaba O'Neal — from Ironwolf
- April O'Neil — Mirage
- April O'Neil — Archie
- April O'Neil — IDW
- April O'Neil — Teenage Mutant Hero Turtles
- April O'Neil — uit Teenage Mutant Ninja Turtles
- April O'Neil — TMNT, 1987 TV series
- April O'Neil — TMNT, generic
- April O'Neil — TMNT, 2003 TV series
- April O'Neil — TMNT, 2012 TV series
- April O'Neil — TMNT, 1990s-2007 movies
- April O'Neil — Rise of the TMNT
- Denny O'Neil — comics creator
- Jenny O'Neil — Lug/Semicverse, amie de Photonik
- Lucius O'Neil — Mangler
- Sally O'Neil — policewoman, from Quality
- Scarlet O'Neil — from comic strip
- Titus O'Neil — professional wrestling
- Erin O'Neill — Blue Monday
- Jack O'Neill — from Stargate
- Angie O'Plastey
- Brigid O'Reilly — Mayhem
- Brigid O'Reilly — Mayhem
- Conner "Rebel" O'Reilly — Marvel
- Kyle O'Reilly — professional wrestling
- Seymour O'Reilly — from Spider-Man
- Seymour O'Reilly — Marvel
- Seymour O'Reilly — Marvel
- Rose O'Rion
- O'Rork
- Li San O'Rourke — from Atari Force
- Li-San O'Rourke
- Lydia O'Rourke — Top Cow / Image
- Lydia O'Rourke — Misery, Top Cow / Image
- Riot O'Rourke — AC
- Erin Bia O'Rourke-Singh — Dart, from Atari Force
- Devlin O'Ryan — of Xanthu
- Jack O'Ryan — Nathan Never
- Abigail O'Shay — Madame Crow, from Batman
- Abigail O'Shay — Madame Crow / Opfer-Syndikat
- Boomer O'Shea — Impact, Top Cow / Image
- Boomer O'Shea — Impact, Top Cow / Image
- Darling O'Shea — Spirit character
- Detective O'Shea — DC, from Huntress
- Spud O'Shea — Commando Cubs, Standard/Better/Nedor
- O'Slempix — Asterix
- Beth O'Toole
- Kelly O'Toole — from DC's Mister E feature
- Knuckles O'Toole — Young Allies, Timely Comics
- Leila O'Toole — Plasma
- Leila O'Toole — Marvel, Plasma
- Mickey O'Toole — Mercury the Boy Streak, from Lev Gleason
- Patrick O'Toole — Young Allies, retcon
- Sharky O'Toole — Robotech
- Smokey O'Toole
- O'Torinolaringologix
- Ray O'Vac — from Ray-O-Vac Batteries
- Vernon O'Valeron — Vartox, Post-Crisis
- Mister O — Transformers
- O-Sensei — from Richard Dragon
- The O-Sensei — DC, from Richard Dragon
- O.M.N.I.T.R.O.N.I.C.U.S. — Marvel
- OMAC — Buddy Blank
- O.M.A.C. — Kevin Kho
- OMAC — a generic member of the OMACs
- OMAC — Michael Costner, of the OMACs
- OMAC — Buddy Blank, Earth A.D. - Earth 51, DC
- OMAC — DC, un membre générique des OMAC
- OMAC II — DC, Authority
- Lord OMikel — from Ironwolf
- Darren Oak — the second Captain Canuck
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