Which obscure mutants would you like to see and learn more about?
My pick: I recently learned about Unveil, which is what prompted this thread, and find her utterly fascinating. She could easily be resurrected.
She can release and transform into psychotropic mists, making her insubstantial while her substance can connect the minds and emotions of other people, unlock repressed memories, conceal the physical presence of people and shield minds from detection or manipulation. She can also transport herself and others through long distances with her mists.