Ignored, abandoned or just downright badly written...the UN-appreciated.

[Chris0013]

Priscilla Lyons / Vagabond: Not seen since the 90s
Barney Barton / Trickshot: Brought back from the dead and made his brother's equal....just to be shuffled off to editorial limbo
John Walker / U.S. Agent: I keep getting disappointed with writers just always doing the heel turn on him like in the latest Cap.

Who do you got to add to the list??

[Spiderfang]

Scott Washington (AKA "Hybrid") not seen since the 90's (Separation Anxiety saga), resurfaced in the 2010's only to be killed off.

[Hybrid]

Johnny Gallo / Ricochet: A unique example of a mutant who isn't an X-Man, and is a major Spider-Man fan. He's the only Slinger to get any real following individually but even then he's still firmly in the D-list range. He could be so much more, but the writers don't do much with him despite making a good impression.

[Huntsman Spider]

Scott Washington (AKA "Hybrid") not seen since the 90's (Separation Anxiety saga), resurfaced in the 2010's only to be killed off.

Johnny Gallo / Ricochet: A unique example of a mutant who isn't an X-Man, and is a major Spider-Man fan. He's the only Slinger to get any real following individually but even then he's still firmly in the D-list range. He could be so much more, but the writers don't do much with him despite making a good impression.

Agreed with you both. I would throw in the Scarlet Spiders as well, given their treatment in the last few years circa The Clone Conspiracy and its aftermath, along with any 616 Spider-Woman that isn't Jessica Drew.

[danielsan52]

Lectronn - Seldom seen but extremely powerful. Could make for a good Avenger if he got a better costume.

Wildstreak - Debuted in Fantastic Four, she was paralyzed and confined to a wheelchair but for the use of her exoskeleton suit that gave her enhanced strength and speed.

LightBright - Another mutant never seen in the X-books. Would love to see her on Krakoa.

[Riv86672]

Frogman.
A goofy street leveler that could be hilariously fun getting in over his head under the right team.

Armageddon Man.
A mutant that can potentially destroy the earth. He’s in suspended animation somewhere.
Honestly surprised Hickman hasn’t co-opted this guy yet.

Miracle Man.
Come on Marvel, use the character why don’t you.

The Ultraverse.
Marvel really did that line of comics wrong.

[Thor-Ul]

Frogman.
A goofy street leveler that could be hilariously fun getting in over his head under the right team.

Armageddon Man.
A mutant that can potentially destroy the earth. He’s in suspended animation somewhere.
Honestly surprised Hickman hasn’t co-opted this guy yet.

Miracle Man.
Come on Marvel, use the character why don’t you.

It is a good question. Maybe they were only interested in kkep the brand. Or it was the excuse to make Gaiman to work for them.

The Ultraverse.
Marvel really did that line of comics wrong.

Oh, yes they did. At this time I would be surprised if ever I could see something related to Ultraverse ever published again. Maybe the Ultraverse could have had better luck if DC had bought Malibu instead Marvel. Marvel doesn't seems very inclined to promote IPs from acquired companies.

[jackolover]

Thank god Rich Rider begins to be important again in Annihilation Scourge, and Empyre due to Guardians of the Galaxy. Now all we need back is Nova Prime and Worldmind.

[Montressor]

I LOVED the Armageddon Man story and have long waited for someone to touch on that again. I'm assuming he's still asleep, deep in some remote S.H.I.E.L.D installation (Avengers Mansion has been destroyed a couple of times).

[Vordan]

Frogman.
A goofy street leveler that could be hilariously fun getting in over his head under the right team.

Armageddon Man.
A mutant that can potentially destroy the earth. He’s in suspended animation somewhere.
Honestly surprised Hickman hasn’t co-opted this guy yet.

Miracle Man.
Come on Marvel, use the character why don’t you.

The Ultraverse.
Marvel really did that line of comics wrong.

They can’t touch Miracleman until Gaiman finishes his story and frankly I’m surprised you want them to. You really think he’ll be better used as part of the MU’s meaningless event cycle rather than separate in his own universe where he actually is important and interesting? What would they even do with him, have him job to Carol or Hulk or Sentry or whoever?

[Sutekh]

The Avengers Academy kids, particularly Reptil, Stryker and Finesse. I thought those three, in particular, had potential, in unanswered stories as to their potential and their powers origins.

[williamtheday]

They can’t touch Miracleman until Gaiman finishes his story and frankly I’m surprised you want them to. You really think he’ll be better used as part of the MU’s meaningless event cycle rather than separate in his own universe where he actually is important and interesting? What would they even do with him, have him job to Carol or Hulk or Sentry or whoever?

When I saw "Miracle Man", I was thinking of the hypnotist from Fantastic Four#3, 1962!

[Dreaded Porcupine]

Frogman.
A goofy street leveler that could be hilariously fun getting in over his head under the right team.

I’d love to see Spencer include him in ASM. He’s doing wonders for Fred Myers the Boomerang. He’d probably make Frogman very likable.

[J. D. Guy]

Scott Washington (AKA "Hybrid") not seen since the 90's (Separation Anxiety saga), resurfaced in the 2010's only to be killed off.

Still haven't forgiven Brock for being able to punk him like some day-one newbie (nor the then-writers/etc. for writing it in the first place). I'd love someone like David F. Walker writing a book about Hybrid/Scott Washington. I feel a writer like him would do him justice.

To the list, I also would add Patrick Mulligan/Toxin. He was also unceremoniously offed, off-screen no less, yet was impossibly cool. He and his relationship with his Symbiote was unique; the closest we got to something similar was Flash-as-Agent Venom during the later parts of Agent Venom's existence.

All the cool good-guy Symbiote heroes were so underused and misused.