Hecate isn't really much of a Goddess, either. She's a Chthonic Deity. While technically a Goddess, it's only in a similar sense to Nike, Nemesis, Eros, etc. All the minor Gods, Goddesses, Spirits, and Personified Concepts. Not very dark either.

http://tvtropes.org/pmwiki/pmwiki.php/Main/DarkIsNotEvil