Lets See if I can use my newly found powers of monster creation just for a bit of fun.
Once upon a time...not so long ago, in the City of Spice, there appeared a strange pumpkin in a pumpkin patch. It turns out that an Elderly Man and his wife had always wanted children, but never had managed to have any. So, they begged to heavens and the hells that some being of power would grant their dearest wish.
One on All Hallows Eve, that wish came true with this strange, living, pumpkin like humanoid. They took this little pumpkin shaped child in and called him Pumbor. As he grew, he was much tougher than any pumpkin, for his skin was mottled and tough as Iron. His body was shaped like a pumpkin in many ways, but with a head of an orange faced human, and limbs as humanoids go as well.
His adopted parents doted on him, but he was evil through and through. One day, shortly after his twentieth birthday, he showed his true colors and ate and devoured his parents. He also showed an uncanny ability to create strange creatures he called Jacks which basically were creatures with sticks as their bodies with Jack O'Lanterns on their heads.
With the ability to create one of these per day, he soon took over the city of Spice and demanded its citizens worship him.
His nickname behind his back is one his mother used to call him...pumpkin. These days, if he hears it, he goes into a rage and single-mindedly tries to slay the one who used it.
His creations, Jacks, enforce his will in Spice. They are deceptively weak, and many would be saviors of the town find that though they easily mow these creatures down, it gives them a sense of over-confidence when facing Pumpkin. They have all died to Pumpkins evil rage.
Pumpkin is the son of a pumpkin, Fraz-Urb'Luu, and the essence of pure evil. Fraz-Urb'Luu found the Monkey's Paw he gave the elderly couple hilarious, as it granted their fondest wish which became their doom.
The Citizens of Spice Pray for the day someone can deliver them from this horror that has arisen (or raised by their own beloved couple) in their town.