I made this wallpaper in my Computer Graphic and Animation/Media Art classes in high school. Now Phineas and Isabella do make a lovely couple. Even if Phineas is unaware of Isabella's feelings for him. Tell me if you agree.
Phineas and Isabella belong to Dan Povernine, Jeff "Swampy" Marsh and Disney.
Phineas definitely likes Isabella. Have you watched Phineas and Ferb: Across the 2nd Dimension? Because they finally kiss in that episode! But if you've seen it, then you know what happens next.