Icarus (Joshua "Jay" Guthrie) is a mutant superhero. He was a member of the student body at the Xavier Institute and a member of the New Mutants training squad. Jay was the son of Thomas and Lucinda Guthrie. Thomas dies early in Jay's life due to black lung, developed from working in local Kentucky coal mines. Jay's older siblings Sam (Cannonball) and Paige (Husk) are mutants as well, and both have been members of the X-Men. When he himself developed mutant powers, he hid them from his family. When performing in his band, he exposed his wings to the crowd as a 'stage gimmick'. Believed to be descended from the ancient race of Cheyarafim mutants, Icarus possesses red feathered, angel-like wings which allow flight and produce regenerative enzymes allowing him to recover from normally fatal injuries. When his wings were removed, he lost his healing factor. His voice is capable of producing sonic frequency beyond the range of human capability as well as creating multiple sounds or voices at once.

Icarus is among the 198 mutants who retain their powers after M-Day, when the Scarlet Witch depowered most mutants on Earth. However, William Stryker convinces him to remove his wings in exchange for his friends' safety before killing him.

Icarus is among the many mutants who are resurrected by the Five following the foundation of Krakoa as a sovereign nation.^[1][2]

An alternate universe variant of Icarus from Earth-295 appears in Age of Apocalypse. This version is a servant of Mister Sinister who possesses artificial wings and is later killed by Magneto.^[3]

The Icemaster (Bradley Kroon) is a fictional supervillain created for one of a series of Hostess advertisements; his advertisement debuted in December 1979. He later entered the mainstream comics continuity as a member of a new incarnation of the Masters of Evil, created by Kurt Busiek and Mark Bagley.

Although how he gained his powers and abilities is unknown, Bradley Kroon had plans to create the next ice age as the Icemaster. He had frozen much of New York until he encountered the Human Torch. The Human Torch defeated him by throwing Hostess Fruit Pies to him, inducing his surrender.^[4]

Icemaster later appeared as a member of Crimson Cowl's Masters of Evil. In the story's plot, Icemaster is defeated when Hawkeye tricks Scorcher into accidentally blasting him. Before that, Icemaster accidentally hits Man-Killer, one of his own teammates, with an ice blast.^[5]

During the Fear Itself storyline, Icemaster is among the supervillains that escape from Raft after Juggernaut destroys it.^[6][7] He is later defeated and transferred to Pace Federal Penitentiary.^[8][9]

Iguana is a fictional character appearing in American comic books published by Marvel Comics. He first appeared in Spectacular Spider-Man #32 (July 1979), and was created by Bill Mantlo and Jim Mooney.

Iguana is a normal iguana who was infused with part of Curt Connors' life-force and memories following an accident with his bio-enervator machine, gaining the ability to assume a humanoid form during the night.^[10] In subsequent appearances, he battles Spider-Man before being killed by Kraven the Hunter's Hunter-Bots during the "Hunted' storyline.^{[11][12][13][14][15]}

Iguana appears in The Amazing Spider-Man.^[16]

Ikthalon is a demon who has clashed with Daimon Hellstrom. Ikthalon lives in a dimension known as the Ice World of Ikthalon. Ikthalon is an embodiment of man's tendency to resist change, and thus represents frozen stagnation.

Ina is a leopard, along with Biri, lost their mother, Julani to a guard. at the Central Park Municipal Zoo, veterinarian Shanna O'Hara was asked to take her cubs Ina and Biri to Dahomey, Africa to release them into the wild. They are both killed when the sorcerer, Raga-Shah, transferred their life forces into the blood beast, Ghamola, which Shanna was forced to destroy.

Infectia was a mutant in the Marvel Comics universe. She first appeared in X-Factor #28, published May 1988, and was created by Louise and Walt Simonson.^[17] Her mutant power allowed her to induce lethally unstable mutations in humans. She served as a minor adversary of the X-Force until she died of the Legacy Virus in X-Men (vol. 2) #27 (December 1993).

She reappeared in the Krakoan era as a refugee in the "Embassy of Limbo" in New York in Dark X-Men (vol. 2) #1 (August 2023).

Infinity is a cosmic entity associated with the concept of Space.

Ink
Ink. Art by Michael Ryan.
Publication information
Publisher	Marvel Comics
First appearance	Young X-Men #1 (April 2008)
Created by	Marc Guggenheim (writer) Yanick Paquette (artist)
In-story information
Alter ego	Eric Gitter
Species	Human
Team affiliations	X-Men-In-Training[broken anchor] Young X-Men
Abilities	Iconic tattoos on his body grant him several abilities.[18]

Ink (Eric Gitter) is a fictional superhero character appearing in American comic books published by Marvel Comics. The character was created by Marc Guggenheim and Yanick Paquette. As a member of the Young X-Men, the character is depicted as a normal human being who gained superpowers after being tattooed by a mutant. Each of his tattoos gives him a different power.

Ink is one of the founding members of the Young X-Men team that believed themselves to have been organized by Cyclops. He is a loud-mouthed and rude teenager with a criminal past. He is introduced when two police officers attempt to arrest him in a tattoo parlor. He fights back using his newly acquired ability to make others violently ill with a touch by utilizing a new tattoo on his hand of a biohazard symbol, making the police officer instantly very sick. Despite this, he is arrested anyway.^[19] While Ink waits in jail, a prison guard releases him, in the process revealing himself to be Cyclops, leader of the X-Men. In short order, Eric is recruited into Cyclops' junior X-Men team. The teens are assembled in the Danger Cave, a training facility where they train for their first mission: assassinating the original members of the New Mutants who have gone rogue.^[19]

Cyclops sends Ink and a fellow recruit, Blindfold, to attack Dani Moonstar. On their way to Moonstar's cabin, they had a conversation where Blindfold implied Ink was not a mutant. They were successful in their mission, and just after Blindfold knocks Moonstar unconscious, Ink betrays her and knocked out Blindfold, warning her that she should have seen that coming.^[20] Ink was paid to deliver both Blindfold and Moonstar to Donald Pierce, which he did, though he refused to kill them. He delivers the two women to Pierce, who refers to him as a mercenary.^[21] "Cyclops" is later revealed to be Pierce in disguise, whose goal is to manipulate the Young X-Men into killing the former New Mutants. Upon learning this, Ink appears to suffer a crisis of conscience and leads the Young X-Men and New Mutants to Pierce's hideout. They subdue Pierce, but not before Wolf Cub is killed, leaving Ink to deal with his own feelings of guilt over his involvement.^[22]

Later, it is revealed that Ink is actually a normal human being, and that his tattoo artist, Leon Nunez is a mutant. Presumably, the tattoos he draws gave Ink his powers because Ink explains the desired functions of each tattoo prior to getting them to Nunez. Emma Frost runs a scan on him at Dani Moonstar's request that confirmed him as a baseline human, and Pierce knew this before he recruited him.^[23] Ink takes the knowledge hard and quits the team, feeling unwelcome already for his involvement with Pierce.^[18] While wandering San Francisco drunk, he is attacked by the Hellfire Cult, a mutant-hating gang. Ink easily defeats them, telling them that he's not a mutant and they wasted their time. Then a girl named Cipher appears and tells him he's still an X-Man and his friends are being attacked by the Y-Men, a group of gang members similarly empowered like Ink by his tattoo artist.^[24] Together they go to Nunez and force him to give Ink two new tattoos, a caduceus symbol on his left palm and the Phoenix Force symbol over his eye, much like Phoenix-hosts Jean Grey and Rachel Summers. They then go save the Young X-Men from the Y-Men. Ink saves and heals Dani Moonstar with the caduceus tattoo and defeats the Y-Men with his Phoenix powers, explaining that he believed the Phoenix Force to be omnipotent, thus granting him the ability to remove the Y-Men's tattooed powers.^[25]

It is decided later that Ink will stay with the X-Men and train, Cyclops not wanting someone to run around with Phoenix-like powers unwatched. Moonstar and Sunspot explain that inking powered tattoos saps Nunez's willpower and that adding the Phoenix Force tattoo to Ink pushed him too hard, leaving Nunez comatose. In this state, he is barely conscious enough to maintain Ink's powers, though if he ever wakes up, Ink will revert to a normal tattooed human. Graymalkin later offers his friendship to Ink, noting that he too understands what it feels like to be different and ostracized.^[25] When Dust begins to die from a hidden health condition, Ink attempts to heal her with his caduceus tattoo, but fails. Her death upsets him, causing the others to realize that he now cares about the team. He later speaks to her prepared body, stating that she is the last person to deserve death and he is the first. Knowing that his Phoenix tattoo is untested, he uses it to revive her. He is successful, but the strain leaves him comatose, Beast stating that his mind has activity, but is subdued, "as if it's been overcharged". Beast also postulates that his current state is because his tattoo could only approximate the powers of the Phoenix and that he never actually contained the true energies associated with the Phoenix Force, making his actions an incredible strain. His actions may have ramifications for the future, with the last two issues of Young X-Men depicting a dystopian future and a villainous and powerful Dust seeking to kill all mutants and Ink in particular for "killing her soul" by reviving her.^[26]

He appears in unexplained full recovery containing the San Francisco riots, as well as later in the fight against the Dark Avengers, alongside other X-Men in the Dark Avengers/Uncanny X-Men: Utopia storyline.^[27][28]

Ink has no powers of his own. Instead, he had access to a mutant tattoo artist, Leon Nunez, with the power of granting superpowers to other beings by tattooing iconic "power symbols" on them, evocative of the power he wants to bestow. The downside to this is that it takes away a little bit of Nunez's will every time he does it.^[18] Nunez made Ink believe that his powers were his own, purposely misleading him into believing he was a mutant. Since granting Ink his last tattoo—the omnipotent Phoenix Force symbol around his eye—Leon Nunez has been in a catatonic state. If he were to wake up, it is thought that Ink's power would disappear, leaving him a normal boy.^[25] This was not the case however as Eric was able to get more body art after his phoenix tattoo was removed and he had obtained new body art.^[29]

In a dystopic future depicted in the final two issues of "Young X-Men", a disproportionately aged, wheelchair-using, heavily tattooed, and seemingly brain dead Ink lives on "Xaviera", a former mutant safe-haven independent state and utopia along with adult versions of Anole and Graymalkin and an aged Emma Frost (now calling herself "Diamondheart"), and Wolverine, the only four remaining mutants on Xaviera. Emma constantly hopes that he will awaken and speak, though Wolverine states that he never does.^[30] Dust suddenly appears, now greatly changed in her appearance and persona with altered powers. She quickly confronts and kills the others and finds Ink. It is then that Ink speaks, acknowledging her presence. They discuss Sooraya's resentment of mutants "allowing her to die" and how Ink "killed" and "corrupted" her soul and making her what she is now by reviving her. Ink states that he was trying to do the opposite and asks her if she recognizes the gravity of her actions. Understanding that she does not, he tells her to get it over with and she kills him, stating that she is sorry as she knows that his heart was in the right place.^[26]

Ink appears in X-Men: Days of Future Past, portrayed by Gregg Lowe.^[31] This version is a G.I. during the Vietnam War whom William Stryker attempts to capture for Bolivar Trask's experiments before Mystique rescues him. In an alternate 2023, he is a prisoner of the Sentinels.

Invisible Gorilla is an anthropomorphic gorilla and animal version of Invisible Woman.

Jason Ionello is a fictional character in Marvel Comics. The character, created by Kurt Busiek and Pat Olliffe, first appeared in Untold Tales of Spider-Man #1 (September 1995).

Jason Ionello was a popular student at Midtown High School who would often pick on Peter Parker along with Flash Thompson, Liz Allan, Sally Avril and Tiny McKeever. Ironically, they all idolized Spider-Man, not knowing that was actually Peter. He eventually attempted to learn Spider-Man's identity to earn a $1000 reward.^[32] He enlisted Sally's help in this endeavor, but became jealous when she flirted with Spider-Man.^[33] Later, Jason ran a red light while trying to catch Spider-Man, but collided with another vehicle. Sally was killed, and Jason suffered mild head trauma.^[34] Jason was left feeling bitter and soon turned on Flash and his friends.^[35] Later, Peter throws a party for Jason and Tiny, but Jason refuses to accept Peter as a friend.^[36] He later saves Liz during a fight between Spider-Man and the Headsman.^[37] Jason becomes depressed and attempts suicide, but is stopped by the Vulture who convinces him to blame Spider-Man for his problems.^[38] Jason disguises himself as Spider-Man and starts committing vandalism and brandishing a gun in an attempt to damage Spider-Man's reputation. Liz and Flash discover his exploits and talk him out of it.^[39] Jason was last seen in The Amazing Spider-Man #622 (February 2010) attending a party for Flash.^[40]

• Jason Ionello makes non-speaking cameo appearances in The Spectacular Spider-Man as part of Flash Thompson's football clique.
• Jason Ionello appears in media set in the Marvel Cinematic Universe, portrayed by Jorge Lendeborg Jr.^[41]
  • In Spider-Man: Homecoming, he co-hosts Midtown School of Science and Technology's news station with Betty Brant.
  • In Spider-Man: Far From Home, it is revealed that Ionello was a victim of the Blip before being resurrected by Bruce Banner.
  • Ionello makes a cameo appearance in Spider-Man: No Way Home.

Iron Mouse is an anthropomorphic mouse and animal version of Iron Man from Spider-Ham's universe, Earth-8311.

Iron Mouse appears in the Ultimate Spider-Man episode "The Spider-Verse" [Pt. 2], voiced by Steven Weber.^[42]

Iso (Xiaoyi Chen) is an Inhuman character, created by Charles Soule and Ryan Stegman, who first appeared in Inhuman #4. She is among the latent Inhumans who had their abilities activated after the detonation of the Terrigen Mist bomb, gaining the ability to manipulate pressure.

Iso appears in Avengers Assemble, voiced by Tania Gunadi.^[43]