One of my favorite X-Men supporting cast members has to be Stevie Hunters. A human dance instructor who use to be a professional dancer before a knee injury took her out of competition dance.
http://comicbookdb.com/character_chron.php?ID=178
Turns out I own 69 percent of her appearances! She was involved in three storylines that didn’t have Kitty in them, as she was off in Excalibur. Those three 90s crossovers are X-Tinction Agenda, X-Cutioner’s Song and the Muir Island Saga.
Not bad at all, really.
She was also involved in the first few issues of New Mutants Volume One and I own a few of those as Illyana doesn’t show up in every issue of that series at the beginning.
Shadow and Flame with Magik 