Zeno's worst nightmare and Mannick's first friend.
Working for Byss Labs, Dr. Hayter performed experiments on Zeno, the purpose of the study as of yet unknown.
He also was involved in the project known as "Blackbox" which involved the cabin Menu moved into, which he left for another known as Project X.
Ostensibly this is the project Mannick was the subject in, as he first appears in the comic with a shirt emblazoned with a giant black X.
Obviously was a vampire when Zeno and Mannick met him, but was friends with vampire hunter John Marlowe and his wife Annebelle previous to being turned, as a photo of the two guys hanging out in bright sunlight indicates.