Sixth Ranger: Subverted, he only joined the X-Factor because he felt that he was helpless to stop the Marauders from killing the Morlocks. Soon after, he decided to join Apocalypse to make himself stronger.
The Cape: Originally Cyclops' protege, and stated to have to potential to become a significant leader/figure for mutantkind. He went to prison as part of a protest over the treatment of mutants.....and then he got put on the first of many buses.
Abusive Parents: She comes from a military family, where both she and her father idolized her older brother. Joanna was a sickly, unplanned second child, and her father was actively abusive towards her. After her brother was killed in action, her father went off the deep end and nearly killed her, but then her powers kicked in.
But Not Too Black: Frenzy is black, but artists and colorists occasionally struggle with remembering that. She's gone for entire story arcs looking like a white woman with a slight tan.
Good Is Not Nice: Yet another former supervillain who's joined the X-Men. Frenzy will do the right thing if she's asked or ordered to, but her first instinct is almost always to hit somebody, and she genuinely has a hard time caring whether or not baseline humans die.
Heel Face Brain Washing: In Eve of Destruction storyline, Jean Grey was desperate to find a new team, and quickly to save Professor Xavier. She acknowledges that one of Magneto's lieutenants, Frenzy, has been captured by the US Army. Not only does Jean enter her mind to get the info she needs on Genosha (Magneto's island) and its defenses, but she thinks that having a superpowered guide in that hellhole would be a good idea, so she just rewrites Frenzy's mind and makes her an X-Men enthusiast (so fanatically devoted to the X-Men cause, all of a sudden, that it was creepy).
Important Haircut: In the "Age of X" crossover, Frenzy was a X-Man in good standing and Cyclops's lover. When reality snapped back to normal, Frenzy had to do some soul-searching to decide what she wanted to do next. That came along with shaving half of her head, changing her outfit, and deciding to join the X-Men.
Lightning Bruiser: Frenzy has respectable levels of superhuman strength combined with some degree of military training. She can be terrifying in a fistfight.
Alexander "Alex" Summers/ HavokSee X-Men 60s MembersLorna Dane / PolarisSee X-Men 60s MembersJamie Madrox / Multiple ManA former foe of the Fantastic Four. One of them discovered he was a mutant and handed him over to the X-Men.
Ascended Fanboy: Jamie Madrox keeps attempting to treat his Mutant adventures as Noir Detective novels. He usually fails miserably.
Cloning Blues: For some time, his clones were cool with being who they are. Then things started getting weird. One turns traitor and joins with the long-term X-Men enemy Mister Sinister. Another dies of the Legacy Virus. Jamie starts going around the bend because he's just too much people for one man. Later, he gets it together but his clones don't. All the thousands of aspects, idiotic or not, in the human mind tend to get manifested in his clones. He can and has created a clone to free him from a prison cell but it's possible the clone will be his sadness and be too depressed to move. Another is unpredictable and tries to kill an old ally. It is reabsorbed but indicates that it could pop out in any future clones and go try to kill again.
Mundane Utility: Jamie constantly uses his dupes like this, sending them out to learn and explore the world, creating them on the other side of locked doors, playing duets on piano and the super-babysitting.
Power Incontinence: Strong Guy has the power to absorb kinetic energy and redistribute it as super strength, but if he doesn't let it out soon enough, it has affects on his physiology (which is the reason for his... unique appearance).
Rahne Sinclair / WolfsbaneSee New MutantsPietro Maximoff / QuicksilverThe son of Magneto who was separated from him and believed to be dead. Raised by gypsies, he developed a strong fixation on his sister, Wanda Maximoff. After Magneto saved Wanda from a anti-mutant mob, the two were indebted to him and were reluctantly part of the first incarnation of the Brotherhood of Mutants. After Magneto was abducted by aliens and the Brotherhood disbanded, Quicksilver and Scarlet Witch served for a long period as members of The Avengers, where they redeemed themselves. However, old habits and revelations about villainous heritages are hard to fight, and the two continue to bounce back and forth between good and evil and sane and insane. He's also the ex-husband of Crystal from The Inhumans and they have a daughter named Luna, but his relationship with them is... utterly troubled.
Anti-Hero: Generally a Type II, but recently downgraded to type IV, and briefly even type V, since most American writers don't like stereotypcial "Euro Trash" characters.
Bishounen: Depending on the art, Quicksilver is usually not a bishounen except for X-Men Evolution cartoon. However, in one X-Factor issue, he was called 'Pretty Boy' by his inmates when he was put in prison for vagrancy.
Brought Down to Normal: He thought he had it bad when life moved in slo-mo, but after losing his powers, everything seemed so... fast. He went crazy, stole mutating mists from his in-laws, and used them to get time travel powers.
Jerkass: Quicksilver has been a good guy, bad guy, and in-between, but never stops being an arrogant, self-centered dick. This extends to his other incarnations, such as his apperances on the different cartoons and Ultimate X-Men.
Time Stands Still: Quicksilver once explained his angry personality by asking his psychologist to imagine living in a world consisting entirely of the slowest queue at the checkout.
The Unfavourite: Magneto's relationship with his kids is equally screwed up, with Scarlet Witch and Quicksilver being the Un-Favorite in both the regular and Ultimate Marvel Universe.
In particular, in the Ultimate Marvel Universe, Magneto is quite open with with his disdain for Quicksilver/favoritism towards Wanda, by "punishing" Wanda for betraying him by way of making her watch him kneecap her brother, who Magneto berated for going to work for the Ultimates.
Valerie CooperStarted as a subordinate to Senator Kelly and Agent Henry Peter Gyrich, later rose to become a kind of US government superpowers and mutant czar and one of the top people of the O*N*E. Served as government liaison to X-Factor for a long time and also appeared a few times in the current incarnation of the title.
Badass Normal: The Shadow King once sent her to assassinate Mystique, but at the crunch she overcame his mind control enough to turn the gun on herself.
Adaptive Ability: Random's main mutant power is adaptive shapeshifting. He can harden his skin when stabbed or reconstitute himself from protoplasmic goop when caught in an explosion. The guns are just his preferred form for combat.
Bad Powers, Bad People: Subverted, since Random is actually a heroic guy whose unsettling power is to shoot you with guns.
Until recently, he was a Mook in the Marauders team.
Not exactly. Just like back in the days, when he had to fight X-Factor, he has doubts on his allegiance. Also, he's shown to be the more charitable of his team... suggesting to his foes that they're lucky having to fight him, because he's the nice one.
Executive Meddling: One plotline Peter David was not allowed to go through under the company policy of the time was to have Val Cooper become attracted to Random only to find out that he was actually a woman who used her shapeshifting to appear male. David then changed Random's secret into him being a lot younger than he appeared.
It is worth noting that his musclebound antihero appearance was supposed to be the shapeshifters idea of what a badass looks like, not his actual appearance. Subsequent writers have forgotten this, and even when depowered he is depicted as uber-ninties.
Shapeshifter Weapon: He can turn his arms into guns. With dozens of barrels. You see what I mean about him being the nineties.
A group consisted of a few old X-Factor members Multiple Man (leader), Strong Guy and Wolfsbane as well as the new members Siryn, Rictor, M and Layla Miller working in a detective style agency. The newest members included are Darwin, Longshot and Shatterstar. Wolfsbane, after a brief stint in X-Force, has returned.
James "Jamie" Madrox / Multiple Man See "X-Factor Government Team" Above. Guido Crossela / Strong Guy See "X-Factor Government Team" Above.Theresa Cassidy / Siryn / BansheeSee XForceMonet St. Croix / MSee Generation-XJulio Richter / RictorSee "Original X-Factor series" above.Layla Miller
Seer: Her power comes off this way. Until it's later revealed that all of her knowledge of the future was implanted by her memories of her future self, which is why there are so many holes in her knowledge.
Stable Time Loop: Layla's knowledge of the future was implanted by her future self, and after she grows up, she eventually goes back and does the same to her younger self.
Body Horror: His powers allow him to evolve to survive, resulting in some horrifying transformations. Shot with a weapon that targets the nervous system, he becomes a sponge creature. Crushed beneath wreckage, he's reduced to an oozing mass that can speak. Decapitated by a headshot, a second head starts growing out of his torso, and so forth. Thankfully these are temporary changes, but made worse that he's got no control over what he'll become.
Race Lift / But Not Too Black: Lampshaped within the series. Darwin's powers had turned him white in a primarily white community "to better survive", but once he gains some confidence he changes himself back to his original darker skin tone. The characters point out the Unfortunate Implications of this.