O
Odie: [USA] The lovable, drooling and dumb-as-a-door dog from Jim Davis' series Garfield & Friends.Ofelia: [Spain] The secretary at T.I.A. from Fransisco Ibáñez' series Mortadelo y Filemón.
Old Man: [USA] Former hero from Jim Krueger's series Foot Soldiers.
Old Trusty: [USA] Retired police dog from Disney.
Olga Lawina: [Netherlands] Freelance agent from Martin Lodewijk's series Agent 327.
Olive Oyl: [USA] Popeye's sweetheart from Elzie Crisler Segar's series Popeye the Sailor.
Oliver Queen: [USA] The original Green Arrow from DC Comics (pre-crisis Earth-1, post-crisis Earth-0).
Omni-Man: [USA] Character from Robert Kirkman's part of the Image Universe.
Ondine: [USA] Character from Avalon Studios.
Oracle: [USA] Barbara Gordon from DC Comics (pre-crisis Earth-1, post-crisis Earth-0).
Orson:
1: Orson: [USA] The original name for Tweety from Looney Tunes.
2: Orson: [USA] The kindhearted bibliophilic pig from Jim Davis's series U.S. Acres.
Oswald the Lucky Rabbit: [USA] Walt Disney's original rascal.2: Orson: [USA] The kindhearted bibliophilic pig from Jim Davis's series U.S. Acres.
Otto:
1: Otto: [USA] The blacksmith in Nottingham from Disney's version of Robin Hood.
2: Otto: [Denmark] Anders Brønserud's lonely palindrome.
Ottoperotto: [Italy] The Beagle Boys' dog (Disney).2: Otto: [Denmark] Anders Brønserud's lonely palindrome.
Outsider, The: [USA] Alfred Pennyworth's criminal alias (DC Comics, pre-crisis Earth-1, post-crisis Earth-0).
Overlord: [USA] Antonio Seghetti, the first Overlord and leader of the Vicious Circle from Erik Larsen's part of the original Image Universe.
Owl: [United Kingdom] The wise bird from A. A. Milne and Disney's series Winnie The Pooh.
Ozymandias: [USA] Character from Alan Moore's Watchmen (DC Comics).