These profiles represent (for the most part) individuals. Certain collective beings may be found here as well. Heroes and Villains, Cosmic entities, and civilians are the major examples.

X (Robot X)

X (Brotherhood)

X of the Thanosi (Infinity Abyss character)

X the Marvel (Power Man foe) - by Spidermay

X, the Thing That Lived (Marvel Monster, Alpha Flight/Big Hero 6 foe) - by Prime Eternal

X1 (Dr. Jerome Hamilton)

Xa (Dimension of Exiles)

Xak (Spawn of the Monster from the Lost Lagoon)

Xakku (Sun-Stealer)

Xalnor (xt, Gramosian, Captain Marvel (Mar-Vell) foe)

Xaltotun (Conan foe)

Xam of Reality-8116 (A-Team member)

Xan (Atlas Foundation member) - by Proto-Man

Xander the Merciless (Dr. Strange foe)

X'Andria (college student, America Chavez character) - by Chadman

Xandu (Spider-Man/Dr. Strange/Scarlet Witch foe) - by Spidermay

Xanja (Spider-Man foe)

Xanna (1950s, Microverse dictator) - by Ron Fredricks

Xanth (Ebon Seeker)

X'anth (xt, Western Salt Hills liege)

Xantia (Super Soldiers) - by Changeling

Xaos (demon, Doctor Strange foe) - by Markus Raymond

Xaos (Cerebro's nanotech X-Men)

Xaphan (demon, Deadpool/Ghost Riders foe) - by Markus Raymond

Xar (Fantastic Four character) - by Proto-Man

Xarus (Dracula's son & foe) - by MarvellousLuke

Xarus the First (Xarus)

Xavier, Benedict (19th century, Professor X ancestor, Wolverine character) - by MarvellousLuke

Xavier, Brian (Professor X's father) - by MarvellousLuke

Xavier, Charles

"Xavier, Charles" (Onslaught)

Xavier, Dr. James of Earth-92131 (Professor X great-great grandfather, X-Men '92 cartoon) - by Zuckyd1

Xavier, Nate (Professor X) of Earth-253

Xavier, Sharon (Professor X's mother) - by MarvellousLuke

Xavier-Marko, Sharon (Sharon Xavier)

Xavier the Fallen (Charles Xavier counterpart) of Earth-98101

Xbalanque (Mayapan, Red Hulk ally)

X-Beast (predator, would-be ruler of Cyclaedea, Die-Cut foe)

Xcon’s Iron Man (Black Panther foe) - by Prime Eternal

X-Cutioner (Carl Denti, X-Men/Gambit foe)

Xeethra (Ape Lords)

Xemnu the Titan (Kirby monster, Hulk/She-Hulk foe) - by Madison Carter

Xemu (Fifth Dimension, Fantastic Four foe)

Xena (Wyrd Sisters)

Xeniac (Sentry foe) - by LV!

Xenic (Conan foe)

Xenith (Star Masters) - by Prime Eternal

Xeno-Engramatic Robot Organism (X.E.R.O.)

Xenon (Advocates member)

Xenophage (Phage)

Xenophobic Man (US Agent foe)

Xennus (Dr. Strange foe)

The Xenologist (Open Space story) - by Madison Carter

Xenos (Moon Knight foe) - by Prime Eternal

Xeotpik of Earth-8394 (Kamado)

Xepdgin (Froh, Star-Gods)

Xergorgan (White Apes of Sorjoon)

X.E.R.O. (X-51 predecessor/foe)

Xeron the Star-Slayer (Hulk foe) - by Stunner

Xerxes (Microverse, Carnage ally/foe)

Xevioso (Voodoo Thunder God, aka Shango)

X-F3 (Growing Man)

Xhoohx (Defenders character, Tunnelworld)

X'Hoss (ancient extraterrestrial magic user, the Designate associate) - by Donald Campbell

Xiambor (Thanos foe)

Xian (Atlas Foundation member) - by Proto-Man

Xiao (Freelance Restorations, Shang-Chi character) - by Prime Eternal

XII (Forgotten, Merlin captive) - by Proto-Man

Xina of Earth-712 (Ape X)

Xiomara (Atlantean, Andromeda ally)

Xiombarg (Conan foe) - by Spidermay

Xiquiripat (Serpent Men)

Xira (Spirit)

Xirdal (Norman Osborn character)

"Xirquirtel" (Conan foe)

Xiuhpilli (Huitzilopochtli)

Xlyym (Starblasters) - by Prime Eternal

X-Man (Alternate Hulk/Xavier/Reed) - by Sammy7D, Luis Dantas & Snood

X-Man (X-Men foe, Blockbuster special) - by AvatarWarlord72 & Technarch

X-Man of Earth-95120

X-Man of Earth-1032 (Millennial Visions) - by Proto-Man

"X-Men Gold Wolverine" (Weapon X synthoids)

Xom (Atlas era alien) - by Grendel Prime

Xoorr (Mole Men)

Xorak the Outcast (Ancient One/X-Men foe)

Xorr the God-Jewel (Thor foe)

Xotai (Conan foe) - by Spidermay

Xotli (Conan/Mitra foe)

X-Press (Marvel Year-in-Review joke character) - by Loki

X-Ray (Silver Sable's Wild Pack, Spider-Man character) - by Spidermay

XR79B (xt tourist, 1959)

"X-Sentinel" of Earth-9612

X-Stream (Hydrators)

Xtoral Laxtan (Thanos foe) - by Spidermay

X-Treme (Adam-X the X-Treme)

XTT-4 (pre-FF future robot) - by John Kaminski

"X2" (Robot X creation)

X-2/3rds of Earth-24530 (smart-alecky Exiles member)

X-23 (Laura Kinney)

X-23 of Earth-92131 (Cassandra Nova)

X-36 of alternate reality (failed servant prototype, before 2090 AD)

Xú Fú (209 BC, Order of Hydra)

Xuthl (Conan foe) - by Greg O

Xylophone, Charles of Earth-88131 (ALF ally) - by Grendel Prime

Xxar, Xxan (Fantastic Four character) - by Norvo

Xxirys (controlled by Frank Johnson, Zzutak's enemy)

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