My Little Pony\Teletubbies

Princess Celestia as Tinky Winky (both are the biggest and oldest)

Princess Luna as Dipsy (second biggest and oldest. Also, the print on Dipsy's hat looks like it has Luna's Cutie Mark all over it.)

Princess Cadance as Laa-Laa (second youngest and smallest)

Princess Twilight Sparkle as Po (youngest and smallest)

Discord as Noo Noo (both like to cause chaos for their victims, suchs as trying steal favorite things)