If you guys watch the show you will understand this.
Buffy × Kat
Anya × Lynne
Willow × Little Mo
Cordelia × Belinda
Dawn × Zoe
Faith × Hayley
Ashley Tisdale × Stacey
These are the character that I feel that are parallel to the Slater. I chose Ashley Tisdale because she looks like Buffy and Lacey Turner was cast as Stacey because she looked like Kat
