Knell

Knell is a pervert, to put it bluntly, and was a member of the resistance.

Personality
Knell is indeed a perv. He is also very cruel, as he uses dead demons as his familiar spirits and planned to make Nora his familiar, though it is possible he will not continue his plan as he left the resistance.

Background Information
Fire magic can't harm Knell.

Knell left the resistance in volume 6.

His magical weapon manifests itself in the form of a scythe.