Saty is the owner of the "Third Eye Cafe" in the Demon World along with her pet, Mamejirou. Despite being silent in the anime, we'll be having her mumble insulting things about her most common customer (and the main character of the series), Staz.

She also tends to reveal her hatred toward Staz when he's not around.

An ideal tone for this character would be somewhat whispery or mumbly, but sassy.