No one quite knows who Halloween Spirit is or even WHAT he is! The most mysterious member of the Sinister Six, a powerful magic user with a wide variety of spells and knowledge under his belt. Despite being a villain, he's very affable to others. Halloween is the time of year when Halloween Spirit's magic is at it's most powerful, so he aims to find a time spell in order to make it Halloween night forever and become infinitely powerful.

Also because he loves the holiday, as do his three magic-made children!