He appears to be a smug opportunist and a swindler, as seen in "Come Sale Away", where he manages to cheat each Loud sibling by giving them "Lily's blanket" in exchange for their garage sale money.
In "Out on a Limo", Lincoln states that he never gives him free smoothies, which means that Flip is stingy.
In "Intern for the Worse", he comes between Lincoln and Clyde's friendship, by making them compete for higher ranking staff positions at his store, much to his advantage.
Flip is also a very disgusting man, as seen in "Intern for the Worse" where he sells expired milk, and uses the melted cheese machine to put his dirty clothes, mostly his socks. He also falsifies lottery tickets with a black marker. The oil he uses in his store was actually hot dog grease. His disgusting behavior is shown again in "Roadie to Nowhere", where he has so much gunk on his teeth which Rita tries to remove. He also has a false tooth made out of beef jerky, which Luna faints in shock.
Flip is an old man of short stature. He has gray hair, and a bald spot on his head. He has a gray mustache, and eyebrows as well. He wears a white t-shirt, brown pants, and black shoes. In Season 1, he had white eyebrows, but starting with Season 2, his eyebrows are gray.
In "Roadie to Nowhere", it is revealed that he has bad dental hygiene which he states that running his store was more urgent, and furthermore, according to Rita, his appointment has been ready for 10 years.
In "Net Gains", it is highly likely he has went to prison before, since one of the inmates recognized him as both he and Lynn were driving by.