This article is a stub. You can help Fictional Characters Wiki by expanding it. Marionette Louise "Mary" Test is one of the main protagonists of the Cartoon Network cartoon Johnny Test. She is the eldest of two twins, both being Johnny's older sisters. Gallery Add a photo to this gallery Retrieved from "https://characters.fandom.com/wiki/Mary_Test?oldid=128398" Categories: Article stubs Johnny Test Characters Female Teenagers Characters with glasses Genius Blue eyes Twins Sisters Inventors Protagonists Scientists Girly Girls Human Heroines Canadian Scottish European Red Hair Main Protagonists Siblings Smart characters 2000s Characters 2004 Characters Debuts Community content is available under CC-BY-SA unless otherwise noted.