|Real Name:||Sidney Green|
|Current Team Affiliation:||None|
|Previous Team Affiliation:||Young X-Men, Chevaliers|
|First Appearance:||X-Men (Vol. 2) #171|
|Death Occurrence:||X-Force (Vol. 3) #23|
|Brief Description of Powers and Abilities:||Rock Body, Durability, Strength|
|Source of Powers:||Human Mutant|
|Note:||Onyxx was jealous of Gambit over Foxx.|
|Currently:||Onyxx was killed by Wither.|
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