Anne Steele, Joan Appleby, Sister Sunshine, Chantarelle, Lily Houston - Buffy / Angel
The Chosen One: Blonde bombshell Julia Lee took up a wealth of names in the Buffy-verse, playing...forget it. I'm not writing all those names again.
Her Stake in Things: Originally an abused girl named Joan, Anne re-invented herself as Chantarelle, a vampire worshipper, before nearly ending up a blood-cocktail and moving to LA as a runaway under the name Lily Houston. When THAT didn't work out, she founded a shelter for wayward teenagers as Anne Steele (a name derived from Buffy's middle name), encountering the crew of Angel investigations and Wolfram and Hart numerous times. Still with me? Anne even appeared in the Angel finale, helping Gunn live out his last peaceful day.
Leaving Los Angeles: Unless Julia too's been changing her name and living out several lives, the only post-Angel credits of note are Grind and Free Ride.