As I am creating my character, now. How the hell is he able to get involved with the institute, if i'm not allowed to use the non X-men parts of the Marvel universe? I mean, it's hard to come up with something that isn't just generic as all hell. I mean, if the larger universe is off the table, then I assume S.H.I.E.L.D. But, what about her surrogates like S.W.O.R.D. (Who's agents include a good number of X-Men, such as Beast and Shadowcat) and A.R.M.O.R. are also out of bounds? Also, is Magic also off the table?
Plus, the more I think about it the "X-Men only" thing is a very broad term? Because, how do you define "X-Men related" I mean if you go by "Started their life as X-men characters" then
Wolverine is off the table, because he started his life as a Hulk villain. If you go with "Integral to the X-Men mythos" then You have to OK Rom The Spaceknight, because without him, Rogue would never have turned good and joined the X-men and gone on to save the world a couple of times.
It was her absorbing his pure heart that made her see the error of her ways and want something better than just being one of Mystique's henchwomen. or even Captain Britain, since 95% of his supporting cast (Including his sister, Psylocke) are X-Men. It's also one of the reasons that we aren't getting a Captain Britain movie anytime soon. Marvel owns him, Fox owns everything surrounding him.
I am not trying to be awkward, it's just that with this "nothing not X-Men related" it is really difficult to say what is and is not. Can you give me a rough description as to what you classify to be X-Men or not?