But I'll emphasize that I really hate all the X-Men-related possible/alternate future characters. They all became "regulars." And none of them should exist. 

To begin with, I have an immediate dislike for characters whose powers are dependent upon other characters having powers. This is only exacerbated when dealing with mutants. Mutants are supposed to be individuals with singular genetic alterations. Their powers are a natural part of their physiology, not some external source that can be turned off or redirected like a faucet. The notion that a character like Rogue or Leech could have powers that "know" that Angel's wings are a mutant power strikes me as inherently wrong.

But Rogue doubles down on this, in that her power absorbing ability isn't even her primary power set. Most of the time, she just flies around clobbering people with Ms. Marvel's stolen powers. This kind of conflation of completely unrelated abilities was a hallmark of Claremont's run, and it used to drive me nuts. Here's a mutant who's a telepath. Oh, but now she's also a ninja! Here's a mutant who casts illusions. Oh, but she's also a Valkyrie! Here's a teleporter, who's also a demon sorceress!

This kind of unnecessary convolution is what led to the whole "secondary mutation" nonsense. Not for me, thanks.

Most of them are derivative or just poorly-conceived directions to take a classic character -

A-Bomb (Rick Jones)

America Chavez

Black Ant

Captain America (as Hydra leader)

Doctor Doom (as Iron Man)

Emma Frost (as X-Man)

Hulkling

Iron Heart

Magneto (as any kind of hero)

Nick Fury Jr.

Norman Osborn (he should have stayed dead)

Red Hulk

Red She-Hulk

Rogue

Sentry

Skaar (how many Hulk knockoffs do we need?)

Spider-Man (Miles Morales)

———

What do people have against Steve Rogers with Michael Jackson’s Jheri curls and big shoulder pads?

I'm not saying they didn't de-unique - wasn't there a character called He-Ro at one point? - but for the most part, it seems like there are enough unique characters to be fun.

Paul, good call on Carnage. Not only is he a slavering, giggling serial killer, he's a rip-off version of a derivative copy. He's three Nineties cliches stacked on top of one another. And since he clicked with fans, we then got Shriek and who knows how many others just like him. 

Ray, your observation on the weird dualities in the X-Men is well-taken.  Claremont had a complete inability to ever say "no" to any way open to him to celebrate his female characters' innate, warrior savvy and indomitable spirits. As long as we're in Japan, we'll take this opportunity to show that Betsy is hardly a fragile English rose. She is, in fact, tough enough, hard enough, clever enough, and spirited enough to be... a ninja! For she has the heart of a Warrior Born! As long as we're in Asgard, we'll take this opportunity to show that Danielle is hardly a frightened young girl. She is, in fact, tough enough, hard enough, clever enough, and spirited enough to be... a Valkyrie! For she has the heart of a Warrior Born! As long as we're in a demonic hell-dimension, we'll take this opportunity to show that Illyana is hardly an innocent small child. She is, in fact, tough enough, hard enough, clever enough, and spirited enough to be... the Queen of Limbo! For she has the heart of a Warrior Born! 

It really did lead to the X-Men becoming a boatload on nonsensical concepts all tripping over themselves to get on-panel. And since no plotline was ever closed, none of it ever went away.

Rebecca, I liked your comment that the Beyonder was just a retread Korvac. That had not occurred to me, yet it is dead-on.

Robbie, to mix metaphors - if you get tired, I'm right here in the corner - tag off! :D

Who do I genuinely dislike? Well, there are too many new characters I'm sure that I hate, save that I haven't read them; they're too new and I don't collect many new books at all any more. But a short list...

The Punisher. A character created with, seemingly, the excuse of being a villain and killing other villains. A cathartic character, perhaps, but his whole theme is murdering people. And I think he could be fixed pretty easily, with one paradigm shift. Certainly, get rid of the guns; but recognize that he's basically he's Batman with a .45. I wouldn't mind him as an anti-hero who's in a darker world than Batman's. Make him dark, and that's fine; he's in a very dark place. But arrest these drug dealers etc., and make them scared of going back to their ways because even when they get out of jail... the Punisher is still waiting.

Lobo: I've not read a lot of Lobo, but enough to know that it's another "ordinary guy" cathartic character - bouny hunter, drinks, smokes, rides a motorcycle, kills indiscriminately. I cannot understand why the Green Lanterns, or Superman, would not have just taken him down and put him in Takron-Galtos. Just a one-shot character with too many bullets. :)

New Luthor and New Brainiac: In the early 80s, DC decided that Luthor and Brainiac weren't sufficiently villainous, and needed to be made worse. So in a giant size issue of Action Comics, Luthor destroyed his "other home" of Lexor and decided that Superman caused it and must be killed ('cause making him bald wasn't a good enough reason any more.) Brainiac was transformed into a completely robotic form that had to kill and capture because... well, it was never very clear. Reading these, the same thought occurred to me: "That's a shame. Now Superman has to see that these enemies are both destroyed." Maybe someone wanted a Joker-level villain for Superman, but I hated both of those characters.

Rogue - but the one in the X-Men movies. Okay, I might not like her so much in the comics, but with the Kree powers, she's a useful character. In the movies? She's Rogue the girl hostage. She serves almost no useful purpose. You say, "But she can steal a villain's powers!" Really? At MELEE range? Is that going to do a lot of good against Sabretooth or the Juggernaut? Had they modified her a little bit and let her do power drains at range, or even let her act as a living Cerebro ("Cyclops, I think that there's somebody in the Statue of Liberty with powers... it kinda feels like Mystique!"), I could like her better.