Just a random thought I had lately.
There have been three Vanessas in Disney history and all of them are evil (or connected to evil):
http://disney.wikia.com/wiki/Vanessa_Doofenshmirtz
http://disney.wikia.com/wiki/Vanessa_(The_Replacements)
http://disney.wikia.com/wiki/Vanessa_(The_Little_Mermaid)
Also, they have dark hair.
Wonder if this is an accident or actually planned?