Chacmool

Jack More is an NPC created by one of the guild members of Ainz Ooal Gown.

Personality
Judging by Demiurge's description, Jack appears to be one of the denizens of Nazarick that view humans as food or toys.

The Dark Hero's Story Arc
While making a list of possible items that the NPCs of Nazarick would desire from Ainz Ooal Gown, Shalltear Bloodfallen recommended that they add humans to the list. Demiurge agreed stating their comrades like Jack More and Neuronist Painkill would find that request desirable.