First Appearances O
  1. Gary Oak. The character basis for Gary, Green (later Blue), first appears in the Pokémon Red and Green Versions video games (1996). The Gary version first appears in the Pokémon anime series premier episode "Pokémon - I Choose You!" (1997) under his Japanese name of Shigeru. His English dub name is established in the dub of the episode (1998).
  2. Samuel "Sam" Oak. The character first appears, under his Japanese name Okido, in the video games Pokémon Red and Green Versions (1996). He receives the English dub name Professor Oak in the English release (where Green is now Blue) (1998). His given name is established in the feature film Pokémon the Movie 2000: The Power of One (2000). His nickname is arbitrary.
  3. Alice Obiefune. The character first appears in the comic book Doctor Who: The Eleventh Doctor #1 (2014).
  4. Oboro of Hoshido. The character first appears in the video game Fire Emblem: If (2015).
  5. Luke O'Brian/Offspring. The character first appears in the comic book The Kingdom: Offspring #1 (1999).
  6. Patrick "Eel" O'Brian/Plastic Man. The character first appears in the comic book Police Comics #1 (1941).
  7. Brian O'Brien/The Clock. The character first appears in the comic book Funny Pages #6 (1936).
  8. Keiko Ishikawa O'Brien. The character first appears in the Star Trek: The Next Generation television series episode "Data's Day" (1991).
  9. Kirayoshi "Yoshi" O'Brien. The character first appears (is born in) in the Star Trek: Deep Space Nine television series episode "The Begotten" (1997).
  10. Miles O'Brien. The character first appears, as "Conn", in the Star Trek: The Next Generation television series pilot episode "Encounter at Farpoint" (1987). His surname is established in the episode "Unnatural Selection" (1989), and his first name in "Family" (1990).
  11. Molly O'Brien. The character first appears (is born in) in the Star Trek: The Next Generation television series episode "Disaster" (1991). Her name is established in "The Game" (1991).
  12. Obsidian (Vehicon). The character first appears in the Beast Machines: Transformers animated series episode "The Strike" (2000).
  13. Brian O'Conner. The character first appears in the film The Fast and the Furious (2001).
  14. Burgundy O'Connor. The character first appears, with the Japanese name of Cabernet, in the Pokémon: Best Wishes anime episode "A Sommelier Showdown! [Dwebble] Vs. [Dewott]!" (2011). Her English name, Burgundy, is established in adapted version of the episode, "A Connoisseur's Revenge" (2011). Her surname is arbitrary.
  15. Otto Octavius/Doctor Octopus/Spider-Man. The character first appears in the comic book Amazing Spider-Man #3 (1963).
  16. Clarence Odbody. The character first appears in the film It's a Wonderful Life (1946).
  17. Oe Kintaro. The character first appears in the Golden Boy manga chapter premiering in Super Jump magazine (1992).
  18. Oedipus. The character first appears outside oral tradition perhaps in Pindar's Second Olympians Ode (c. 500 BCE).
  19. Joan of Arc (clone) (clone). The character first appears in the Clone High animated series premiere episode "Escape to Beer Mountain: A Rope of Sand" (2002).
  20. Alyssa Ogawa. The character first appears in the Star Trek: The Next Generation television series episode "Clues" (1991).
  21. Ogma. The character first appears in the video game Fire Emblem: Shadow Dragon and the Blade of Light (1990).
  22. Tim O'Hara. The character first appears in the My Favorite Martian television series debut episode "My Favorite Martian" (1963).
  23. Bucky O'Hare. The character first appears in the comic book Echo of Futurepast #1 (1984).
  24. Jonathan Ohnn/Spot. The character first appears in the comic book Peter Parker, the Spectacular Spider-Man #97 (1984).
  25. Oifey. The character first appears in the video game Fire Emblem: Genealogy of the Holy War (1996).
  26. Oin. The character first appears in the novel The Hobbit (1937).
  27. Daniel Okagawa. The character first appears in the Star Trek: S.C.E. ebook novella Foundations, Book One (2002).
  28. Okamura Hiro/Toyman. The character first appears in the comic book Superman #178 (2002).
  29. Olaf (snowman). The character first appears in the animated feature film Frozen (2013).
  30. Tora Olafsdottir/Ice/Icemaiden. The character first appears in the comic book Justice League International #18 (1988).
  31. Ben Olafson. The character first appears in the The Puzzle Place television series debut episode "Tippy Woo" (1995).
  32. Olimar. The character first appears in the video game Pikmin (2001).
  33. Olivia (pig). The character first appears in the children's book Olivia (2000).
  34. Olivia of Regna Ferox. The character first appears in the video game Fire Emblem: Awakening (2012).
  35. James "Jimmy" Olsen. The character first appears in the The Adventures of Superman radio serial (1940).
  36. Sandra "Sandy" Olsson. The character first appears in the musical stage play Grease (1971).
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