O*N*E
O*N*E Sentinels
Obliterator

Maht Pacle
Geschlecht: ♂
Member of: Elders of the Universe

Oblivion

Minion(s): Deathurge

Obnoxio the Clown

Geschlecht: ♂
Universe/Dimension/Timeline: Whattheverse

Obnoxio the Clown vs. X-Men 1
What the -- ?! 13, 24

O'Brien, Michael

Geschlecht: ♂

Features:
Captain America Annual 10

Obscurity Legion
Occult

Peter Quinn
Geschlecht: ♂
Alias of: Peeper
Member of: Brotherhood of Evil Mutants, Mutant Force, Resistants

Occulus

(Unforgiving One)
Universe/Dimension/Timeline: Unknown Universe/Dimension/Timeline

Fantastic Four (I) 364

O'Connell, Dr. Jeannine

Geschlecht: ♀

Ocsh the Darkhawk ship

 

Octavius, Otto (HoM)

Geschlecht: ♂
Alternate version of: Doctor Octopus I
Universe/Dimension/Timeline: Earth House of M

Octessence

 

Oddball I

Elton Healy
Geschlecht: ♂
Member of: Death-Throws

Oddball II

Orville Bock
Geschlecht: ♂
Member of: Death-Throws

Odin
Odin (MiMa)

Odin
Geschlecht: ♂
Alternate version of: Odin
Universe/Dimension/Timeline: Earth Mini Marvels

Features:
Black Widow (I) 3

Odotopians

(Odotopians)
Subgroup of: Alien Races

Offenders
Officer O'Krime

 

Offset

Geschlecht: ♂
Member of: Shi'ar Death Commandos

Ogor

Individual of: Kallusians

Avengers (I) 14

Ogre

Member of: Factor Three

Ogu

Geschlecht: ♂

Blade (III) 11 - 12

Ogun
Oh, Jake

Geschlecht: ♂

O'Hara, Young Miguel (Young)

Geschlecht: ♂
Alternate version of: Spider-Man 2099
Universe/Dimension/Timeline: Earth 2099 A.D.

Spider-Man 2099 18 - 20, 22 - 23, 26 - 30, 32 - 34, 38

Ohyaku

Geschlecht: ♂

Okonkwo, Idie

Geschlecht: ♀
Alias: Oya
Member of: Five Lights

Ol' Flame Head
Old Lace

Member of: Runaways
Owned by: Arsenic

Old Skull

Member of: Killraven's Freemen
Universe/Dimension/Timeline: Earth War of the Worlds

Old Soldier (SP)

Geschlecht: ♂
Universe/Dimension/Timeline: Earth Supreme Power

Squadron Supreme (III) 11

Olivier

Geschlecht: ♂

Olympia

Headquarter of: Eternals of Earth

Olympus

Headquarter of: Greek Pantheon

O'Meagan, Alfie

Geschlecht: ♂

Omega

Michael Pointer
Geschlecht: ♂
Alias of: Michael Pointer
Member of: Dark X-Men

Omega the Unknown 1 - 10
Blockbuster (UK) 8

Omega Core
Omega Flight I
Omega Flight II
Omega Gang
Omega Red
Omega Red (Ult)

Universe/Dimension/Timeline: Earth Ultimate

Omega Sentinel

Karima Shapandar
Geschlecht: ♀
Member of: Excalibur II, X-Men I

X-Men (II) 200 - 201


Features:
X-Men (II) 200

Omega the Ultimate Alpha

Geschlecht: ♂
Individual of: Alpha Primitives

Omega the Unknown
Omniverse
One Above All
One-Eyed Jacquie

Geschlecht: ♀
Member of: G.R.A.M.P.A.

Oneg the Prober

Individual of: Celestials

O'Neil, Alan

Geschlecht: ♂

Features:
Spider-Man: Brand New Day Yearbook 1

Onslaught
Onyxx

Sidney Green
Geschlecht: ♂
Individual of: Mutants
Student(s) at/of: Xavier Institute for Higher Learning

Oog

 

Opal

Geschlecht: ♀

Features:
Marvel Swimsuit Special 1

Opal Lun Sat-Yr9

Opal Luna Saturnyne
Geschlecht: ♀
Alias of: Saturnyne
Universe/Dimension/Timeline: Unknown Universe/Dimension/Timeline

Operation: Lightning Storm

Headquarter(s): Minicarrier 13
Member(s): Agent Sum, Ms. Marvel I

Operation: Rebirth
Operative

Dennis Piper
Geschlecht: ♂
Member of: Mystery Men

Oracle I

Geschlecht: ♀
Member of: Imperial Guard of the Shi'ar

Orator

Victor Ludwig
Geschlecht: ♂
Member of: Acolytes

Orb I

Drake Shannon
Geschlecht: ♂

Solo Avengers 19

Orb II

Geschlecht: ♂
Individual of: Mutants

Orb of Agamotto
Orbucen
Orcale II

Member of: S.H.E.

Ord

Geschlecht: ♂

New X-Men (II) 40

Order (CE2)

Alternate version of: Master Order
Member of: Young Allies II
Universe/Dimension/Timeline: Counter-Earth II

Order I
Order II
Organizer

Abner Jonas
Geschlecht: ♂
Minion(s): Bird-Man I

Ori

Geschlecht: ♂

Blade (III) 11 - 12

Origin

 

Origins Corporation

Creator(s) of: Aberration, Axon, Morass
Leader of: General John Ryker
Subgroup(s): Gamma Corps Black

Orion

Viktor Uvarov
Geschlecht: ♂
Member of: Leviathan IV

The Mighty Thor Annual 16

Orka
Orphan-Maker

Peter
Geschlecht: ♂
Partner(s): Nanny

Orrgo the Unconquerable

 

Ortlinda

Geschlecht: ♀
Member of: Valkyrior

Osborn, Elizabeth
Osborn, Harold Theopolis
Osborn, Harold Theopolis (M2)

(Harry)
Geschlecht: ♂
Alternate version of: Harold Theopolis Osborn
Child(ren): Norman Osborn, Jr.
Universe/Dimension/Timeline: Earth M2

Osborn, Harold Theopolis (MiMa)

Geschlecht: ♂
Alternate version of: Harold Theopolis Osborn
Universe/Dimension/Timeline: Earth Mini Marvels

Features:
Avengers (III) 21
Captain America (III) 20
Spider-Girl (I) 11

Osborn, Harold Theopolis (Ult)

(Harry)
Geschlecht: ♂
Alternate version of: Harold Theopolis Osborn
Universe/Dimension/Timeline: Earth Ultimate

Features:
The Official Handbook of the Ultimate Marvel Universe 2005: The Fantastic Four and Spider-Man 1

Osborn, Norman Virgil
Osborn, Norman, Jr.

(Normie)
Geschlecht: ♂
Alias: Green Goblin V
Beloved: Raptor II
Parent(s): Harold Theopolis Osborn (M2)
Universe/Dimension/Timeline: Earth M2

Spider-Girl (I) 19

Osiris

(Sky-Father)
Geschlecht: ♂
Individual of: Gods of Heliopolis

Other-Earth
Ouranus

(Uranos)
Geschlecht: ♂
Individual of: Greek Pantheon
Parent(s): Gaea

Outback

Frederick Myers
Geschlecht: ♂
Alias of: Boomerang
Member of: Heavy Hitters

G.I. Joe: The Order of Battle 2

Outcast

Geschlecht: ♂
Member of: Lilin

Outcasts

Member(s): Landslide I

Outer Circle of Enforcers I

 

Outer Circle of Enforcers II

Member(s): Vanisher

Outlaw

Inez Temple
Geschlecht: ♀
Individual of: Mutants

Features:
Deadpool Corps: Rank and Foul 1

Outlaw Kid

Geschlecht: ♂

Kid Colt (I) 82
Wyatt Earp 24

Outlaws
Overdrive
Overlord

Geschlecht: ♂
Individual of: Dakkamites

Overmind
Oversword

Owned by: Odin

Ovoids
Owl
Owl Gang

Member(s): Owl

Ox I
Ox II

Ronald Bloch
Geschlecht: ♂
Member of: Enforcers

Daredevil (II) 98 - 100

Oya

Idie Okonkwo
Geschlecht: ♀
Alias of: Idie Okonkwo
Member of: Generation Hope

Oyakata

Geschlecht: ♂

Features:
Deadpool Corps: Rank and Foul 1

Ozymandias

Geschlecht: ♂