Master Guard

Master Guard (real name unknown) is a defender of the first castle.

Biography
Not much is known about who or where he was from, but at some point he was in a different army. It is not specified how he knows Vesper but he either saw or fought and killed Vesper. He also has some knowledge about Alters, and seems to have a hatred for them. He was killed in Episode: 5 by Linn.