Kurenai

The animated series isn't too clear on this, but the FoR manga explains that Kurei's gift is to bring back the dead as living flames he can then command. This talent is used to interesting effect later in the series.

Kurenai is the living flame raised from the spirit of a girl Kurei loved. But then nobody ever claimed Kurei was anything but a seriously twisted guy...
 

Added: 3/28/09 From: Celga
 
Kurenai