Leblanc=Celine Dion
I'd rather kill myself. Seriously Leblanc CAN'T sing haha, I just know it that the second she opens her mouth it would be like a cat being run over, comical characters can never sing well.
BUT if she HAD to sing well I'd say Keisha White is more fitting, I have no idea why I just do....og Jennifer Saunders!! Omg yes!
EDIT: Hey, interesting idea, let's think up songs the characters would sing if they had to sing something.
I've got some for Leblanc, lol:
Killer Queen~Queen (but it would be the 'We Will Rock You' version for Leblanc)
When you're good to Mama~Chicago
I need a Hero~..er, not sure but I'd say the Shrek 2 version that JS sung.
and
It takes a stronger man/Weakness in Me~Keisha White, best songs for her I think.