Marcos and Twist from the GIfted
I guess you could also throw in the Struckers, wouldn't be two hard
"Everything doesn't have to be about fear. There's room in our line of work for hope, too"- Stephanie Brown, Batgirl Vol 3 #5
"Quit? Like hell I will"- Bette Kane, Beast Boy #3
Was Eclipse from the Gifted mentioned yet. He’s much different from alternate Sunspot that he could be used in comics.
For me its Berzerker and Scale-face. Though both were in comics, they were criminally underused. Once Scale-face got murdered by the cops, Berzerker completely lost it and Cyke had to indirectly kill him. I believe he was supposed to be the electrical kid in X-men evolution, but it could also be the second Maverick (Never did figure it out). Scale-face cameoed in X-men:TAS. I kinda wish they would come back as they were unique.
Silas King was in the 90s series but I don’t think he’s ever been in an X-Book.
TO KNOW HER IS TO FEAR HER: JESSICA DREW THE SPIDER-WOMAN
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MISSING:
Synch's Aura
Northstar and Aurora's shiny hair
Spider-Woman’s cowl costume
More like they didn't know how to write a teenage "goddess". I mean, seriously, how do you write a character like the regal, commanding, dramatic Storm . . . as a kid? And so much of how she is comes from the string of events in her back story. Orphaned in Cairo, manipulated and mistreated by Amahl Farouk, trekked across practically all of Africa and ended up worshiped in Kenya (which, honestly, is a little questionable an outcome and depiction of Black Africans. Their first instinct was to worship someone who had strange abilities?). Would they have all that occur earlier or maybe just pluck her out of Africa during her adolescent trek across the continent? Other adaptations have tried. X-Men Apocalypse did a teenage Storm, but they just had her as a thief that was amped up by Apocalypse. Ultimate X-Men had a teenage Storm but she really didn't feel like Storm.
Anyway, I wouldn't mind seeing Buff, Refrax or Lightwave again. Buff and Refrax are only Husk and Chamber in so much as they represent the "good girl" and "bad boy" archetypes of teen fiction respectively. They approached it very differently than their comic book inspirations. Lightwave is a nice, left-field choice and if they keep her back story it could spice things up for Iceman. As for Spyke . . . I don't hate him. The thing with Evan was that he was just a dumb, irresponsible, cocky kid. He wasn't afraid of his powers. He didn't have any hang-ups about his appearance. He was more interested in having fun than anything else. He didn't even really want to be an X-Man. In some ways, that made him a lot more normal than the rest of the cast. And in a lot of ways fans hated him for it. They seemed to find him a lot more palatable once he got serious and had more baggage after he returned with the Morlocks. So, if they ever did introduce him they'd probably have to make him serious and give him baggage and maybe a tragic back story. And really, he wouldn't seem like Spyke anymore. At least, not like he was for most of the show.