Jeffrey Hunter: He stole Kelly from Zack claiming he fell in love with her, but it was soon revealed he was cheating on Kelly. That meant he never actually fell in love with her and was only pretending to be in love with her to fool her into dating him.
Brian Hanson: A crooked lawyer who was helping Kelly's grandfather keep his property but was secretly selling him out to the Worthington's. He even pretended to love Kelly in order to do so.
Charles Worthington and Derek Worthington: They wanted to take over land belonging to Kelly's grandfather used crooked lawyer Brian Hansen to do so.
Johnny Dakota: An actor who visited Bayside for an anti-drug public service announcement. But was a drug user himself, and was just using the ad for his image, fame and popularity.
Robin: A new teen who was a gold-digger who targeted Screech for the money he was making off a secret spaghetti sauce (unaware it was from the Betty Crocker cookbook) and pretended to love him.
Nerdstrom: Violet's ex-boyfriend who treated her like an object and was a complete snob.
Johnny Walters: The villain from the Collage Years, he was a popular football star who made advances on Kelly and was also trying to use Zack to feed his own ego.
Any others?