WEM3 is mainly a label for all experimental voicebanks recorded with a high, feminine tone. That doesn't stop it from having lore anyway.

Name origin: A "W" rolling around
Short full name: Wister Eble Mautrin III
Long full name: Wisteria Ebleancu Maurillin the Third
Nicknames: Meme, Wist
Species: Wisteria

I suppose you could consider each voicebank a separate flower on the same wisteria plant.