I mean, somewhat tongue-in-cheek, but I'd argue that any of the Hellions could have literally been New Mutants if Xavier had gotten to them first, given that the original Hellions were pretty clearly created as deliberate analogues of the New Mutants.
(It is after all the quickest and easiest way to come up with a whole lineup of new characters meant to be antagonists to an existing lineup of characters).
Cannonball - Jetstream
Mirage - Empath
Magik - Tarot
Wolfsbane - Catseye
Karma - Roulette (obviously their powers don't mirror each other's the same way the others parallel, but its not hard to see how when riffing off the New Mutants lineup and not wanting to make another telepath - likely because Emma was much more directly involved in the Hellions stories in ways Xavier wasn't in the New Mutants so that'd create a lot more overlap there than exists with Xavier and Karma - well, if you want to make a dark mirror counterpart to Karma and you don't want her to be telepathic, what do you go with? "Hey, what if one of the Hellions can hit her enemies with weaponized bad luck - kinda like a riff on 'instant karma'?" LOL I always did think it was funny that given how little Karma's codename has to do with her actual power, the character created just to be her inverse counterpart has a closer thematic tie to Karma's own codename than she does).
And then of course Warpath and Firestar weren't created specifically TO be Hellions/parallels to the New Mutants, and were added to that lineup for other reasons, but there was no need to create analogues to Sunspot and Magma when the teams initially clashed, since they had Jimmy and Angelica there to be Roberto and Amara's sparring partners in those first conflicts.
Which meant, of course, once Jimmy and Angelica DID split from the Hellions....here comes new bruiser character Beef and energy caster/elemental Bevatron.
Poor Doug, the only New Mutant who didn't get his own special nemesis. All because he was so firmly regarded as a noncombatant back then, nobody saw any point to giving him one. LMAO.