Life Drinker (Although Not Really): Not in any literal sense, obviously, this being firm SF and thus vitalism very much not in vogue. But consider the case of the experience addict, who eats forcibly taken memories, or those who take an individualist approach to group-mind transcendence by attacking others to forcibly merge their victims mind-states (pithed or complete, although the latter is a swift path to crazy) into their own. (And, hey, you might as well end up in the younger body while you’re at it, right?)
It ain’t the same thing, but it’s close enough for metaphor.
(And if you were wondering, yes, soul-eaters – which consume your mind and memories and individuality and capacity for choice – are what Eldraeic vampire myths look like.)