Well, 'Fairly Oddparents in the Hidden Leaf' is also quite good. It shows what would happen if Timmy Turner and his fairy godparents ended up in the Naruto universe. There are a lot of comical situations as the Fairly Oddparents try to understand the ninja culture. They also use their magic to solve some problems that the ninja are facing, which makes for a really engaging read.
There's a crossover called 'The Odd Ninja Adventure'. This fanfiction has Naruto meeting the Fairly Oddparents during one of his missions. Cosmo and Wanda's magic causes all sorts of chaos in the ninja world, but Naruto manages to work with them to set things right. It has a great mix of the two universes' elements, like Naruto using his jutsu alongside the magic of the Fairly Oddparents.
One popular 'naruto fairly oddparents crossover fanfiction' is 'Naruto's Fairy Godparents'. In this story, Naruto somehow gets the help of Cosmo and Wanda. It's interesting to see how Naruto's ninja world and the magical world of the Fairly Oddparents blend. They help Naruto with his training in a very unique way, adding a touch of magic to his already powerful ninja skills.