Illyria

Illyria, known as Illyria the Merciless and the God-King of the Primordium, was one of the Old Ones, the powerful pure demons that ruled Earth during the Primordium Age. In 2004, she resurrected in the body of Winifred Burkle, killing her in the process. 
Purposeless and driven by the memories of Fred, Illyria struggled to find her place in the new world, and she ultimately joined the Angel Investigations team in their fight.
==Powers and Abilities==
*Master hand-to-hand combatant
*Superhuman strength
*Superhuman durability
*Superhuman speed
*Superhuman agility
*Regeneration
*Time manipulation
*Immortality
*Magical mastery
*Portal creation
*Teleportation
*Communication with plants
*Heightened awareness
===Dual personality===
Following her resurrection, Fred acquired a "Jekyll-and-Hyde"-esque dynamic with Illyria.[citation needed]
*Persona swapping
*Suspended aging