Mason (メイソン, Meison) is Sig Curtis' assistant at his meat shop. 

Mason Vfmafanonwiki2
Vital statistics
Aliases The Masked Man
Birthplace Unknown
Date of Birth Unknown
Age Unknown
Family Unknown
Affiliations Curtis Meat
Alignment Unknown
Species Human
Occupation Butcher's assistant at Curtis Meats
Rank Unknown
Abilities Martial Arts

Survivalism Butchery

Power Level Unknown
Weapons Pestle
Unique Trait Unknown
Goal Unknown
First Appearance Unknown
Voice Actor Josh Martin (FUNimation Dub)
Seiyū Unknown