|First appearance:||"Collect Her"|
|Last appearance:||"The Powerpuff Girls Rule!"|
|Voice actor:||Tom Kenny|
Lenny Baxter is a greedy comic book geek and the villain of "Collect Her". He is a huge obsessed Powerpuff Girls nerd and owns every piece of Powerpuff Girls merchandise ever made. He refuses to open the packages because he claims it would destroy the items' collectors' value. In "Collect Her", he captured the Powerpuff Girls and put them in packages. The girls were saved by Professor Utonium and the citizens of Townsville when they raided his room and threatened to tear open his packages unless he released the girls. He also made a small cameo in "The Powerpuff Girls Rule!".
- Among the items in his collection are the "Buttercup Beat-You-Up Boxing Gloves", the "Bubbles Spits-a-Lot Fountain", the "Blossom I'm-So-Smart Encyclopedia collection", and the Powerpuff cheese and sausage collection.
- His view towards collector's value is similar to the "NRFB" collectors in Dexter's Laboratory.
- He is one of the few villains that the Powerpuff Girls didn't defeat.
- He, along with Mojo Jojo, Sedusa, Mike Brikowski, Dick Hardly and the Gangreen Gang, is one of the only villains to successfully capture all of the Powerpuff Girls.
- He is based on the Comic Book Guy from The Simpsons.
- Lenny's personality is similar to Packrat's from the reboot.
- Lenny had his own segment on Cartoon Cartoon Fridays called "Betcha Didn't Know", where he tells trivia of Cartoon Cartoons such as Dexter's Laboratory as well as The Powerpuff Girls.