Onyxx (comics)
Encyclopedia
Onyxx is a fictional mutant
Mutant (Marvel Comics)
In comic books published by Marvel Comics, a mutant is an organism who possesses a genetic trait called an X-gene that allows the mutant to naturally develop superhuman powers and abilities...

 appearing in comic books published by Marvel Comics
Marvel Comics
Marvel Worldwide, Inc., commonly referred to as Marvel Comics and formerly Marvel Publishing, Inc. and Marvel Comics Group, is an American company that publishes comic books and related media...

. He first appeared in X-Men, vol. 2 #171 and was created by Peter Milligan
Peter Milligan
Peter Milligan born in London, a British writer, best known for his comic book, film and television work.-Early career:Milligan started his comic career with short stories for 2000 AD in the early 1980s. By 1986, Milligan had his first ongoing strip in 2000AD called Bad Company, with artists Brett...

 and Salvador Larroca
Salvador Larroca
Salvador Larroca is a Spanish comic book artist, primarily known for his work on various X-Men titles.-Early life:Salvador Larroca was born and raised in Valencia, Spain.-Career:...

.

Fictional character biography

Onyxx was passed from various foster homes and orphanages, unable to find acceptance because of his crude behavior and chronic bedwetting
Bedwetting
Nocturnal enuresis, commonly called bedwetting, is involuntary urination while asleep after the age at which bladder control usually occurs. Nocturnal enuresis is considered primary when a child has not yet had a prolonged period of being dry...

. However, the latter was cured when young Sidney mutated into the huge rock-like form he now possesses, much to his delight.

Onyxx became a student at the Xavier Institute, assigned to Gambit's
Gambit (comics)
Gambit is a fictional character, a Marvel Comics superhero that has been a member of the X-Men. Created by writer Chris Claremont and artist Jim Lee, the character first appeared briefly in Uncanny X-Men Annual #14 , weeks before a more comprehensive appearance in Uncanny X-Men #266...

 training squad, the Chevaliers. Onyxx had a romantic interest in a new student at the Institute by the name of Foxx. It was later revealed that Foxx was actually a long time adversary of the X-Men
X-Men
The X-Men are a superhero team in the . They were created by writer Stan Lee and artist Jack Kirby, and first appeared in The X-Men #1...

, Mystique
Mystique (comics)
Mystique is a fictional character associated with the Marvel Comics' franchise X-Men. Originally created by artist David Cockrum and writer Chris Claremont, she first appeared in Ms...

. She infiltrated the school to destabilize the relationship between Gambit and her foster daughter Rogue
Rogue (comics)
Rogue was first slated to appear in Ms. Marvel #25 , but the book's abrupt cancellation left her original introduction story unpublished for over a decade, before seeing print in Marvel Super Heroes #11 in 1992. Rogue's first published appearance was in Avengers Annual #10...

. After having revealed herself to the X-Men, Onyxx attacked Mystique for not returning his affection. Mystique escaped and, with the help of an accomplice, injured Onyxx.

Onyxx's fellow student Bling
Bling (comics)
Bling! is a fictional character, a mutant appearing in comic books published by Marvel Comics. She attended the Xavier Institute before its closing and is a member of the X-Men's training squad. Her first appearance was in X-Men, vol...

 was also attracted to Foxx, and their shared infatuation may have been the basis of a friendship, since the two are often seen together. Bling once referred to Onyxx as "Randy," which could be interpreted as a playful nickname ("randy" being a synonym for "horny") but was more likely a writer's error.

Decimation

Sidney retained his powers post M-Day
Decimation (comics)
Decimation is the late 2005 Marvel Comics storyline spinning off from the House of M limited series. It focuses on the ramifications of the Scarlet Witch stripping nearly all of the mutant population of their powers, thereby reducing a society of millions to one of scant hundreds.This event, which...

 and continued residing at the school. Onyxx was critically injured by Reverend Stryker
William Stryker
Col. William "Bill" Stryker, M.D. is a fictional comic book supervillain in the Marvel Comics universe, and enemy of the X-Men. Created by writer Chris Claremont and artist Brent Anderson, he first appeared in the 1982 graphic novel X-Men: God Loves, Man Kills.Rev...

 during his attack on the institute; barely surviving. Onyxx was later captured alongside his fellow students in Limbo
Otherplace
Otherplace, is a fictional location in titles published by Marvel Comics. The concept debuted in Uncanny X-Men #160, and was created by Chris Claremont and Brent Anderson.-History:...

. He is usually shown in the company of Bling.

He currently resides at the Xavier Institute in its new location, San Francisco.

Utopia

Onyxx, along with fellow students Mercury and Loa
Loa (comics)
Loa is a fictional character appearing in comic books published by Marvel Comics. A mutant, Loa is a student at the Xavier Institute. She made her debut in New X-Men: Academy X #5.-Before Xavier's:...

, was tasked with keeping peace at the riots on Telegraph Hill
Telegraph Hill, San Francisco
Telegraph Hill refers to a neighborhood in San Francisco, California. It is one of San Francisco's 44 hills, and one of its original "Seven Hills."-Location:...

. This is after the mutant-hate group "Humanity Now!" marched from Sacramento to San Francisco to promote "Proposition X", displeasing many citizens of San Francisco, mutant and non-mutant alike. After the riots subsided on Telegraph Hill, Cyclops
Cyclops (comics)
Cyclops is a fictional character, the leader of the X-Men superhero team in the . A mutant, Cyclops emits a powerful energy beam from his eyes...

 came and picked them up, taking them to City Hall. He is also seen in the company of Ariel
Ariel (comics)
Ariel is a fictional character, an extraterrestrial mutant in the Marvel Comics Universe. Her first appearance was in Fallen Angels #1...

 when she arrives to pick up an injured Trance
Trance (comics)
Trance is a fictional character appearing in comic books published by the Marvel Comics. A mutant, Hope attended the Xavier Institute before its closing. She retained her powers after M-Day and is a member of the X-Men's training squad....

.

Necrosha

Onyxx is seen amongst those under attack by Selene's new Inner Circle of death mutants on Utopia. Onyxx tries to sneak attack Wither
Wither (comics)
Wither is a fictional character, a mutant appearing in comic books published by Marvel Comics. He has been a member of the student body at the Xavier Institute, a member of the Hellions training squad, and a supervillain as a part of Selene's Coven.-Early life:Kevin Ford developed his mutant...

 while he is distracted by Dust
Dust (comics)
Dust , is a fictional character in Marvel Comics' X-Men-related comic books. She was created by author Grant Morrison and artist Ethan Van Sciver in New X-Men #133 , although her character was not fully developed until the New X-Men: Academy X series written by Christina Weir and Nunzio DeFilippis...

, but Wither catches him and disintegrates him into rubble killing him.

Powers and abilities

Onyxx has a craggy granite
Granite
Granite is a common and widely occurring type of intrusive, felsic, igneous rock. Granite usually has a medium- to coarse-grained texture. Occasionally some individual crystals are larger than the groundmass, in which case the texture is known as porphyritic. A granitic rock with a porphyritic...

 body which gives him superhuman strength and greater resistance to physical injury. He has also been seen to have a second pair of eyes, but it is unknown if these serve any special purpose.

Age of X

In the Age of X
Age of X
"Age of X" is a comic book storyline published by Marvel Comics which features an alternate reality of the X-Men. The first issue of the storyline, Age of X: Alpha, was published in January 2011. Publication continued in February, March, and April 2011...

reality, Onyxx is mentioned as being recruited to Magneto's cause by Nightmare.
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