"Skullmask" is a fully carbon-black furred being of skinny build. It lacks a tail and ears but shows a feline-shaped mouth and nose under the canine skull that uses as a mask.

Their clothing consists of a flat_clap with crossbones on the front side with a remarkably yellow rope tied to the sides above the bill side, and a french maid uniform either in good condition of damaged with white apron, white gloves, white socks and black belted shoes.

"Skullmask'" personalities varies, but the one accompanying Flavio Terracota always looks irritated and intentionally tries to kill him at every chance they have without any sign of success.

• Skullmask's name isn't really a name, it is a nickname because of obviously seen wearing a canine skull mask.

• There is another Skullmask that looks like a barman with golden goggles and dresses a beret instead of a flatcap.

• The tag was going to be named "Skulldog" but at a last minute, it looked better to be named "Skullmask" instead to avoid confusion with the skulldog species.
• Skullmask shares several similarities with the skulldogs.