The manager runs a burger joint.
His hair is white, but he has a thin black mustache.
He is probably insane. He maintains a working torture chamber beneath the burger restaurant. He pays a thug to lurk near a dumpster behind the restaurant to scare off corporate spies who might steal his sauce recipe.
Scooby-Doo! (DC Comics)
He came near to murdering Shaggy Rogers and Scooby-Doo with a pendulum device when they discovered the secret recipe for his sauce, only sparing their lives when Shaggy used his oddball cooking skills to show him how to make his burgers better. Since he hired them as consulting chefs and gave them free food they didn't inform the police about what he did.