Possibly Graydon Creed for most absurd, in a way. It’s sort of emblematic of the various overly-complex sillinesses of the general comic book tropes.
First he was introduced initially looking decidedly middle-aged (at least mid-30’s-ish), although this was somewhat relaxed later. He is the son of Mystique and Sabertooth, making him related to about half the fricking Marvel universe, none of whom care if they know.
He apparently discovered who his parents were (although how, I cannot say, seeing as he was abandoned by his psycho dad and ice-cold-callous mom. He later founded a pro-human anti-mutant group, apparently all because Mommy -and-Daddy-don’t-love-me. Note that he apparently doesn’t believe it; he just wants petty childhood revenge.
Somehow, he got involved with the Upstarts, a random collection of second-rate villains competing for status. His mom decided to kill him because some of his goons beat up her lesbian lover’s grandson., possibly earning a spot in the competition for Worst Mother Ever.
Yeah, you can’t take a break from your busy life killing people and slavishly serving your current (always temporary) employer to raise sonnyboy, but go back in time to waste him because he actually became the leader-born semi-supervillain you always failed at? Sure!
(Seriously, are all comic-book parents Saints or Monsters, or have some complex nightmarish background? Or do the comic writers just have daddy issues?)
Now, Creed has been ressurected (along with Cameron Hodge, the eternal enemy Who Will Not Die Permanently) as some kind of Technarch servant of Bastion, who ironically, was previously a Sentinel and then a human member of Creed’s Freinds of HUmanity. Of course, Creed and Bastion are now super-robot-human super-beings, so it’s kinda moot. Creed has now completely dropped out of sight and it remains to be seen if anyone will ever bring him up again.
I should note that the animated series Creed was even worse off, having been raised (and savagely beaten regularly) by Sabertooth, apparently having deluded himself into blocking his childhood out, and becoming increasingly insane as the series progressed. He was last seen having been dumped his Friends of Humanity into the loving care of his daddy, and may have been killed.
It’s another supervillain, basically, that wassomewhat illl-used because you think, geez, that guy’s life just sucks. There are precious villains you can just hate, and love to hate in the X-men series, because they all have horrible, tragic pasts.