Paper Masks

Also known as "Masks of Amontillado" (as of chapter 143).

Description
Masks appear to be flying heads made of Post-it notes. They scream out business-related words like "MEEEETIIIING!" When killed, they have been seen to drop a fist sized yellow orb.

Abilities
As well as flight, masks contain spines for stabbing their target.

Behaviour
Masks primarily attack the face, and thus far have always been hostile. Their level of intelligence is unclear, but they have been seen operating a copy-projector while shouting, "HIIIIRIIIING!" On the other hand, their group combat tactics are not indicative of a high degree of intelligence.