Poisony

Poisony (Pandora for the YTV dub) is featured in episodes 12 through 20 and is the only woman of the five denizens of the Dusk Zone. Instead of making a big show of calling on Zakennas like Pisard and Gekidorago, she snaps her fingers and is much more discreet about it. She often takes on a human appearance to gain the trust of the girls before attacking. In her true form, she resembles a vampire because she is pale, dresses in black, wears a cape and has fangs.

Etymology
Poisony may come from the world "poison", whereas the "-y" at the end may be an English way to make it an adnoun or adverb.