Werewolf - Katharine Isabelle as Ginger in Ginger Snaps - A brilliant character and film.
Honourable mention to Dog Soldiers.
Witch - Cassandra Gava as The Witch in Conan the Barbarian - Utterly ridiculous, serves only to reveal information, be uncontrollably attracted to Arnie then lobbed into a fire.
Honourable mention to The Witches imagined by Roald Dahl.
Vampire - Stephen Dorff as Frost in Blade - A very cool modern take on the exploitative vampire.
Honourable mention to John Carpenter's Vampires.