Danny Phantom is a popular American animated series that aired on Nickelodeon from 2004 to 2007. The show follows the adventures of Danny Fenton, a teenage boy who gains ghost powers after an accident in his parents' ghost portal. With his new abilities, Danny fights against evil ghosts and protects his hometown of Amity Park.1. "Danny Phantom"
Blue Exorcist is a Japanese manga and anime series that tells the story of Rin Okumura, a teenage boy who discovers that he is the son of Satan. With the help of his brother Yukio and other exorcists, Rin trains to become an exorcist himself and use his powers for good. The series features many supernatural creatures, including blue-haired ghosts known as "Phantoms."2. "Blue Exorcist"
Scooby-Doo and the Ghoul School is a made-for-TV movie that aired in 1988. In this animated film, Scooby and the gang visit a school for girls, where they encounter a group of students who are actually the daughters of famous monsters. One of the students, Sibella, is a ghost with blue hair who becomes friends with Scooby and helps them solve a mystery.3. "Scooby-Doo and the Ghoul School"
The Grim Adventures of Billy and Mandy is a dark comedy animated series that aired on Cartoon Network from 2003 to 2008. The show follows the adventures of two children, Billy and Mandy, and their best friend Grim, the Grim Reaper. In one episode, Grim's blue-haired ex-girlfriend Eris returns and causes chaos for the trio.4. "The Grim Adventures of Billy and Mandy"
The Powerpuff Girls is a beloved animated series that aired from 1998 to 2005. The show centers around three super-powered sisters, Blossom, Bubbles, and Buttercup, who fight against evil forces in their city. One of their enemies is a blue-haired ghost named HIM, who is the personification of evil and often tries to take over the world.5. "The Powerpuff Girls"
Foster's Home for Imaginary Friends is a Cartoon Network series that aired from 2004 to 2009. The show takes place at a foster home for imaginary friends, where they can be adopted by children in need of a friend. One of the main characters is Bloo, a blue-haired imaginary friend who is mischievous and always getting into trouble.6. "Foster's Home for Imaginary Friends"
The Fairly OddParents is a popular Nickelodeon series that aired from 2001 to 2017. The show follows the adventures of a 10-year-old boy named Timmy Turner, who has two fairy godparents, Cosmo and Wanda. In one episode, Timmy's wish for blue hair causes chaos when he is mistaken for a ghost by his classmates.7. "The Fairly OddParents"
Invader Zim is a cult classic animated series that aired on Nickelodeon from 2001 to 2006. The show follows the titular character, an alien named Zim, who is sent to conquer Earth. One of his enemies is a blue-haired paranormal investigator named Dib, who is determined to expose Zim's true identity.8. "Invader Zim"
Courage the Cowardly Dog is a creepy yet heartwarming cartoon that aired on Cartoon Network from 1999 to 2002. The show centers around Courage, a pink dog who lives with his elderly owners in the middle of nowhere. In one episode, a blue-haired ghost named Le Quack tries to scam Courage's owners, but Courage must save them before it's too late.9. "Courage the Cowardly Dog"
The Real Ghostbusters is an animated series based on the hit movie Ghostbusters that aired from 1986 to 1991. The show follows the original Ghostbusters, Peter, Ray, Egon, and Winston, as they continue to battle supernatural beings in New York City. One of their adversaries is a blue-haired ghost named Janine, who is often seen working as their receptionist.10. "The Real Ghostbusters"