so far the X men were teased but also firestar is an Xmen member as far as i knw
Firestar is complicated, since she originated outside of the X-Men in the Spiderman TV Show, only then got added in comics later (
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. I'm assuming this is why Dr. Octopeter is the one to recruit her...
Still, wouldn't say no to adding X-Men characters, but that's kind of a slippery slope... why not also add Inhumans, then maybe some Guardians, even throw in some DC characters cuz why not! Would honestly prefer that dev has fewer options, more plot. Prolly the best possible addition would be a female Silver Surfer, since that's apparently going to be a thing in the new Fantastic Four movie coming out this summer. Ultimate version of Sue Storm who became a female Kang also a good possibility (although Malice is more likely, that's straight out of 616).