Life Force Manipulation – The ability to manipulate the life force of others.
A Deep Stalker can drain the life energy of a victim (Creature Collection III. Savage Bestiary).
The Vamp (Image) is very similar to Selene both in terms of powers and her penchant for black leather (The Bounce #6).
Trilloch – D&D 3.5 – Monster Manual III
Unlife – Creature Collection II. Dark Menagerie
Vasuthant – D&D 3.5 – Monster Manual III
Cassandra Avenger X (Marvel) appears to boost powers but actually takes their life force in Avengers V6 #8.
Kaine Salinger (DC) takes a compassionate business-like approach to sucking the life force out of someone in Outcasts #2.
Zombie (DC) – Bane – Conquest #9