The Signature Line debuted with Frankie, Draculaura, Clawdeen, Lagoona as well as the Cleo/Deuce two-pack. Two new characters Ghoulia and Holt later showed up in case revisions. Two more characters Spectra and Abbey have just recently started showing up in case revisions.
Frankie: Daughter of Frankenstein
Draculaura: Daughter of the Vampire
Lagoona
Clawdeen: Daughter of the Werewolf
Cleo/Deuce
Ghoulia: Daughter of the Zombie
Holt
Spectra: Daughter of the Ghost
Abbey
Abbey
Spectra
Frankie 2.0
Cleo 2.0
Clawdeen 2.0
Lagoona 2.0 (I apparently never took deboxed photos of her O_o)
Draculaura 2.0 & Clawd
Toralei
Operetta
Nefera
Rochelle
Jackson
Clawdeen 3.0 & Howleen
Meowlady & Purrsephone
Cupid
Robecca
Venus