Bill, the grocery store manager runs the local Grocery Store in Fair City. He talks in a strange, sing-songy manner, and is often convinced that the villains and, sometimes, WordGirl herself, are trying to get a job at the store. His name is never said, and even Becky doesn't know his name, seeing as how she referred to him once as "that guy, who manages the grocery store".
In "Caper or Plastic", it is revealed that he used to be a super villain called "The Masked Bagger". He only enjoyed bagging things, not actually stealing. After his super villain career, he returned the goods he stole and got a job at the grocery store.
In the voice cast, it states his name is Bill.