The repeat offender was a villain who gets a crush on Daphne and uses love-related disguises to try to attract her attention.
He has brown hear and wears glasses.
He has a crush on Daphne.
Scooby-Doo! (DC Comics)
At first, he wanted the mineral wealth all to himself, but then he wanted to impress Daphne. Eventually Velma catches on, and Daphne gives him an autographed picture. This satisfies him and he stops his crime streak. (Repeat Offender)