Make a list of your 5 favorite X-Male and X-Female characters. X-Villains can be included on your list. You can also include one honorable mention.
My lists:
X-Males:
Shadow King
Adversary
Gambit
Nightcrawler
Colossus
Honorable mention: Warpath (I can list others, but I restricted the honorable mentions to 1 character.)
X-Females:
Storm
Emma Frost
Selene
Candra
Sage
Honorable mention: Can't think of any right off the bat.