Originally Posted by
salarta
I disagree with "the poly is booked" concerning Jean. For one, Jean's only been shown as in relationship dynamics with Cyclops and Wolverine, meaning only men so far. Someone might argue Emma too, but I haven't seen anything comics-wise to back it up. For another, poly means "more than one partner," meaning Jean could have three, four, five, etc. If she was exclusive to just one person, like Gambit, that might (I stress might) be a different matter.
But to answer the question and take it by its criteria, if Lorna couldn't be with Jean, then I think the next best one down is Emma. They were both involved in Genosha and survived it, Emma has a little insight into what Lorna's been through PTSD wise (her past dismissiveness/mockery of Lorna's struggles in the 00s could be taken as a side of her that secretly cares and is trying to stay distant), and the show Gifted gave good fandom in-roads for that pairing. Lorna's history with Jean could also still come into play this way, given how Marvel's wanted to play up friction between Jean and Emma. The key though would be Marvel not treating it like there's a fight for control over who gets to "own" Lorna in the same way Marvel made that mistake with X-Men Blue over Havok and Magneto.
I also think children or "children" of peers should be completely avoided as partners. There are only two ways I can see this coming off depending on how Lorna's treated, both of them bad. Bad way #1 is Lorna looking like she's preying on one of her long-time peers' kids, taking advantage of them in some sense. That's if Lorna's history is given proper weight. Bad way #2, if her history isn't given proper weight, is Lorna coming off like one of the kids herself. The moment she's "dating" Rachel or Daken or whoever is the moment Lorna's history with their parents gets devalued even further than Marvel's already devalued it, and even more of her past experiences with them are treated like they never happened.
Imagine if Emma Frost dated teen Jean when teen Jean was around. Wouldn't that have seemed off?
Likewise, I wouldn't support Lorna dating Xavier because Xavier has always been a mentor and father figure relative to her, and it would come off more like Xavier's taking advantage of Lorna (a criticism people have made of notions of Xavier with Jean). Ditto for Moira, given Xavier and Magneto are Moira's peers. I would, however, be fine with Lorna dating Legion, as Legion is Xavier's kid and therefore a peer.
Edit: Also, Lorna is at a severe disadvantage compared to her peers in how Marvel sees and treats her as a whole. She has a long history of being treated like she exists to promote Havok, something Marvel's tried to sneak in multiple times these past few years. It's hard not to expect that Marvel writing her in relationship with one of her peers' kids wouldn't be primarily to promote the kid.