Real Name: Guido Carosella Guido was a mainstay of the team, but retired from X-Factor when he absorbed too much energy at once and suffered a heart attack. He went back to working for Lila for a short time, but then returned to Earth and got involved with the mutant fighting league called the Arena. As a member of the Tokyo Arena, Guido was effectively enslaved by the reigning Champion until Storm jumped into one match and deposed the Champion. Guido came to Storm's apartment to warn her not to get involved, and showed her to one of Lila's safehouses, which was hidden in a tesseract (pocket dimension). After Storm defeated Masque and won control of the league, Guido stayed, enjoying the fighter's life.
Some time afterwards, Guido was visting his pal Jamie Madrox and helped him open up a private investigation firm, even suggesting the name "X-Factor Investigations." Now reunited with old pal Wolfsbane, plus new additions Rictor, M, Siryn and Layla Miller, Guido is the muscle of the group, and post M-Day teamed with Rahne to stop a riot against ex-mutants, even facing down the cops when they tried to step in. Unfortunately, Guido at some point was brainwashed by Singularity Investigations, a rival firm looking to stop X-Factor from eventually re-powering all the mutants. He was triggered while transporting Dr. Buchanan, a Singularity employee looking for asylum with X-Factor, and he killed the man. Later he went to apologize to the man's widow and she forgave him.
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