Fa/tg/uy here. I had several ideas for X-Men villians from some of my Mutante & Masterminds/FASERIP Games.>Dybukk
Not entirely an X-Man villian but a villian for Magneto. A mutant, he was a jewish boy Magneto betrayed and gave over to Mr. Sinister when he was a Sonderkommando and Sinister was but buddies with Mengele. He died but his power activated posthumously which makes him an a wraith that exists Limbo and other realms between Heaven/Hell. With Magik opening portals 24/7 to hell/limbo he's escaped to our world. Seeing that Magneto is now butt buddies with Sinister enrages him so he's made it his MO to expose the X-Men & Magneto as frauds and hypocrites for letting Nazis get a free pass because of genetic purity. As a ghost he can haunt people and manifest other wraiths based on those the target has killed. Effectively he"'s the 6 million personified that want to rage against Magneto for being a traitor to his deceased Jewish brethren, especially since he uses their deaths as excuses fir his actions.>GenoXider
A human scientist who was creating better teleportation technology to combat the mutants invasive teleportation gates. While experimenting with them he came across a unique biometal in the borders between reality. X-Force was sent to kill kill him to keep their supremacy and sabotaged one of his experiments, killing his assistant and lover and caused him to become a universal anchor that fused with the biometal he collected, later revealing it was fragments of The Fury from Mad Jim Jaspers reality warping. The Fury is weakened but shares his mind, acting like a symbiote that wants to kill & feed on mutants to repair itself & furfil its orginal programming.