baddie-in-training

noun. An adorable little villain still learning the details of mustache-twirling and mayhem-causing.

Real citation: "Still reserving judgment on Peyton as a baddie, she hasn't really impressed me yet. I guess she can be a baddie-in-training to match up with Rachel's agent-in-training."
(mad maverick, "5-7: "Fait Accompli" 2005.11.17," Nov. 19, 2005, Television Without Pity, http://forums.televisionwithoutpity.com/index.php?showtopic=3133044&view=findpost&p=4014006)

Made-up citation: "You've got to start baddies-in-training young--teach 'em that a lot can be accomplished with a loaded diaper and an evil heart."