The Wailing Banshee was able to cause thunderstorms with her wailing. Prime Evil once summoned the Banshee from 13th Century Ireland to use her thunderstorms to knock out every telephone poll on Earth, destroying all means of communications.
The Banshee never spoke a word, so she probably has no personality, but she's just as evil.
The Banshee wears a purple dress, has red eyes, no visible toes and appears to have froglike features.
The Banchee first appeared in Banish That Banshee.