Lego X-Mansion X-panded

Started collecting custom X-Men minifigures at conventions a few years ago and got to say that the collection has gotten bigger than I ever expected. Know it’s a bit crowded but thought I would ask if anyone has ideas for cool pairings or ways to expand the set aside from just creating more lawn space for the various characters. Also what X-Men minifigures would you like to see one day if any? I’m still waiting for an Apocalypse and Mystique to drop (hopefully with Season 2 of ‘97 around the...