He appears to be an 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. He also falsifies lottery tickets with a black marker.
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.