Jocelyn Fray/John Constantine kid. Willow circ-alt. (Secretly not actually) Xander's half-sister.
Jamie!Slayer verse: Witch; frequently damsel in distress, much to her irritation. Will eventually learn to set things on fire about this.
Clary!Slayer verse: Amateur vampire slayer. Has not yet died of this through improbable Constantine luck and the use of mass quantities of holy water and fire, probably.