Cordelia is the snobby popular person. In the first season nobody liked her. But when she started dating Xander she started drifting into the slayers club. Cordelia isn't much of an action person. Basically if there's danger then she's running away.
Charisma Carpenter got her name from a bottle of perfume her mother bought. She said the perfume stank but she did like the name. Charisma will be returning for the third season of Buffy as Cordelia.