Do you even get the premise of Phineas and Ferb Second, Dan and Swampy DON'T want Perry to have a girlfriend. In fact, giving Perry a girlfriend is a bad idea. It wasn't a wated oppurtnity, it was something they chose not to do. And no, the show wouldn't be good as a thriller. Phineas and Ferb is a comedyand Perry is part of it. Why change it into something it is not? Did you even do any research on the show when you wrote this?