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. Keiko Ishikawa O'Brien. The character first appears in the Star Trek: The Next Generation television series episode "Data's Day" (1991).
  8. Kirayoshi "Yoshi" O'Brien. The character first appears (is born in) in the Star Trek: Deep Space Nine television series episode "The Begotten" (1997).
  9. 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).
  10. 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).
  11. Obsidian (Vehicon). The character first appears in the Beast Machines: Transformers animated series episode "The Strike" (2000).
  12. Brian O'Conner. The character first appears in the film The Fast and the Furious (2001).
  13. 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.
  14. Otto Octavius/Doctor Octopus/Spider-Man. The character first appears in the comic book Amazing Spider-Man #3 (1963).
  15. Emony Odaren Dax. The character first appears in the Star Trek: Deep Space Nine short story anthology The Lives of Dax story "Old Souls" (1999).
  16. Clarence Odbody. The character first appears in the film It's a Wonderful Life (1946).
  17. Odie. The character first appears in the Garfield daily comic strip (1978).
  18. Odin Borson. The character may first appear as "Mercury" in Tacitus's Germania (c. 100). The earliest surviving direct mention of the character is an inscription on a piece of jewelry known as the Nordendorf Fibula, dating to c. 600.
  19. Odo. The character first appears in the Star Trek: Deep Space Nine television series pilot episode "Emissary" (1993).
  20. Shannon O'Donnell. The character first appears in the Star Trek: Voyager television series episode "11:59" (1999).
  21. Wolf O'Donnell. The character first appears in the video game Star Fox 64 (1997).
  22. Kintaro Oe. The character first appears in the Golden Boy manga chapter premiering in Super Jump magazine (1992).
  23. Oedipus. The character first appears outside oral tradition perhaps in Pindar's Second Olympians Ode (c. 500 BCE).
  24. Joan Ofarc (clone). The character first appears in the Clone High animated series premiere episode "Escape to Beer Mountain: A Rope of Sand" (2002).
  25. Alyssa Ogawa. The character first appears in the Star Trek: The Next Generation television series episode "Clues" (1991).
  26. Ogma. The character first appears in the video game Fire Emblem: Shadow Dragon and the Blade of Light (1990).
  27. Jenni Ognats/XS . The character first appears in the comic book Legionnaires #0 (1994). She adopts the XS identity in Legion of Super-Heroes #62 (1994).
  28. Katie Scarlett O'Hara Hamilton Kennedy Butler. The character first appears in the novel Gone with the Wind (1936).
  29. Martin O'Hara/Exigius 12 1/2. The character first appears in the My Favorite Martian television series debut episode "My Favorite Martian" (1963). His real name is established in the episode "We Love You, Miss Pringle" (1965).
  30. Miguel O'Hara/Spider-Man. The character first appears in the comic book Spider-Man 2099 #1 (1992).
  31. Shanna O'Hara Plunder/the She-Devil. The character first appears in the comic book Shanna the She-Devil #1 (1972). She changes her surname upon marrying in Ka-Zar the Savage #9 (1983).
  32. Tim O'Hara. The character first appears in the My Favorite Martian television series debut episode "My Favorite Martian" (1963).
  33. Bucky O'Hare. The character first appears in the comic book Echo of Futurepast #1 (1984).
  34. Jonathan Ohnn/Spot. The character first appears in the comic book Peter Parker, the Spectacular Spider-Man #97 (1984).
  35. Oifey. The character first appears in the video game Fire Emblem: Genealogy of the Holy War (1996).
  36. Oin. The character first appears in the novel The Hobbit (1937).
  37. Daniel Okagawa. The character first appears in the Star Trek: S.C.E. ebook novella Foundations, Book One (2002).
  38. Hiro Okamura/Toyman. The character first appears in the comic book Superman #178 (2002).
  39. Olaf (snowman). The character first appears in the animated feature film Frozen (2013).
  40. Tora Olafsdottir/Ice/Icemaiden. The character first appears in the comic book Justice League International #18 (1988).
  41. Ben Olafson. The character first appears in the The Puzzle Place television series debut episode "Tippy Woo" (1995).
  42. Olimar. The character first appears in the video game Pikmin (2001).
  43. Olivia (pig). The character first appears in the children's book Olivia (2000).
  44. Olivia of Regna Ferox. The character first appears in the video game Fire Emblem: Awakening (2012).
  45. James "Jimmy" Olsen. The character first appears in the The Adventures of Superman radio serial (1940).
  46. Sandra "Sandy" Olsson. The character first appears in the musical stage play Grease (1971).
  47. Omega/Peylix. The character first appears in the Doctor Who television series episode "The Three Doctors, Episode One" (1973). His birth name of Peylix is established in the audio drama Omega (2003).
  48. Omochao. The character first appears in the video game Sonic Adventure (1998).
  49. The Once-ler. The character first appears in the children's book The Lorax (1971).
  50. April O'Neil. The character first appears in the comic book Teenage Mutant Ninja Turtles #2 (1984).
  51. 111. The character first appears in the Star Trek: S.C.E. ebook novella The Belly of the Beast (2000).
  52. Brock's Onix (Onix). The character first appears, unnamed, in the video games Pokémon Red and Green Versions (1996).
  53. Opaka Sulan. The character first appears in the Star Trek: Deep Space Nine television series pilot episode "Emissary" (1993). Her given name is established in the Star Trek: Deep Space Nine novel Rising Son (2003).
  54. Optimus Primal. The character first appears in the Beast Wars: Transformers animated series premiere episode "Beast Wars (Part 1)" (1996).
  55. Optimus Prime. The character first appears in the Transformers animated series episode "More Than Meets the Eye, Part 1" (1984).
  56. Orbitty. The character first appears in the The Jetsons animated series episode "Elroy Meets Orbitty" (1985).
  57. Walter "Radar" O'Reilly. The character first appears in the novel MASH: A Novel about Three Army Doctors (1968).
  58. Bail Organa. The character first appears in the Star Wars radio drama (1981).
  59. Leia Organa. The character technically first appears in the novelization Star Wars: From the Adventures of Luke Skywalker (1976), but more commonly is considered to first appear in the film Star Wars (1977).
  60. Ori (dwarf). The character first appears in the novel The Hobbit (1937).
  61. Orion (New God). The character first appears in the comic book New Gods #1 (1971).
  62. Orko. The character first appears in the He-Man and the Masters of the Universe animated series debut episode "Diamond Ray of Disappearance" (1983).
  63. Orochi of Hoshido. The character first appears in the video game Fire Emblem: If (2015).
  64. Oroku Karai/Lady Shredder. The character first appears in the comic book Teenage Mutant Ninja Turtles #53 (1993).
  65. Oroku Saki/The Shredder. The character first appears in the comic book Teenage Mutant Ninja Turtles #1 (1984).
  66. Byron Orpheus/Doctor Orpheus. The character first appears in the The Venture Bros. animated series episode "Eeny, Meany, Miney…Magic!" (2004).
  67. Triana Orpheus. The character first appears in the The Venture Bros. animated series episode "Eeny, Meany, Miney…Magic!" (2004).
  68. Devlin O'Ryan/Reflex. The character first appears in the comic book Legion of Super-Heroes #6 (1990). The code-name for the adapted version is apocryphal.
  69. Naru Osaka. The character first appears in the Pretty Soldier Sailor Moon manga chapter 1: "Usagi, Sailor Moon" (1992).
  70. Edward "Eddie" van Beethoven-Osako/Metalhead. The character first appears in the comic book X-Men 2099 #1 (1993).
  71. Osbert/Snarf. The character first appears, as Snarf, in the Thundercats animated series debut episode "Exodus" (1985). His real name is established in ???
  72. Harold "Harry" Osborn/Green Goblin/American Son. The character first appears in the comic book The Amazing Spider-Man #31 (1965). He first appears as the Green Goblin in The Amazing Spider-Man #136 (1974), and American Son in The Amazing Spider-Man #597 (2009).
  73. Norman Osborn/Green Goblin/Iron Patriot. The character first appears, as the Green Goblin, in the comic book The Amazing Spider-Man #14 (1964). His true identity of Norman Osborn first appears in The Amazing Spider-Man #23 (1965). He first appears as Iron Patriot in Dark Avengers #1 (2009).
  74. Oscar (Greil Mercenary). The character first appears in the video game Fire Emblem: Path of Radiance (2005).
  75. Oscar the Grouch. The character first appears in the first episode of the television series Sesame Street (1969).
  76. Petronella Osgood. The character first appears in the Doctor Who television series episode "The Day of the Doctor" (2013). Her given name is established in the episode "The Zygon Inversion" (2015).
  77. Oshtur. The character first appears in the comic book Marvel Premiere #5 (1972).
  78. Osiris (god). The character first appears in Pyramid Texts created in antiquity (c. 2400 BCE).
  79. Jonathan "Jon" Osterman/Doctor Manhattan. The character first appears in the comic book Watchmen #1 (1985).
  80. Molly O'Sullivan. The character first appears in the Doctor Who: Dark Eyes audio drama episode The Great War (2012).
  81. Bert Oswald. The character first appears in the first episode of the television series Sesame Street (1969). His surname is arbitrary.
  82. Clara Oswald. The character first appears as the temporal fragment "Oswin Oswald" in the Doctor Who television series episode "Asylum of the Daleks" (2012). Another fracture, Clara Oswin Oswald, as well as her prime counterpart, simply Clara Oswald, both first appear in the episode "The Snowmen" (2012).
  83. Calem Othman. The character first appears in the video games Pokémon X and Y Versions (2013). His surname is arbitrary.
  84. Otr (dwarf). The character first appears, perhaps, outside oral tradition, in the Prose Edda (c. 1220).
  85. Ouranos/Uranus. The character appears, perhaps first, outside oral tradition, in Hesiod's Theogony, written in antiquity.
  86. Owain Dark/Odin Dark. The character first appears, as Eudes, in the video game Fire Emblem: Awakening (2012). He is named Owain in the North American adaptation (2013). He is first referred to as Odin Dark in the game Fire Emblem If (2015). He is formally referred to as Owain Dark first in the game Fire Emblem Warriors (2017).
  87. Owl (Pooh associate). The character first appears in the children's book Winnie-the-Pooh (1926).
  88. Leland Owlsley/Owl. The character first appears in the comic book Daredevil #3 (1964).
  89. Olive Oyl. The character first appears in the Thimble Theatre daily comic strip (1919).
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