Danny Phantom (real name Danny Fenton) is the main protagonist of the Nickelodeon animated series, Danny Phantom. He is a half human/half ghost superhero of his home town, Amity Park and protects it from ghost attacks. He is best friends with Sam and Tucker and is the younger brother of Jazz Fenton. He is also the main love interest of Sam Manson.
Living with his ghost-obsessed parents since his birth, Danny had to put up with their unique personalities that often traumatized him as well as constantly being forced to listen to his parents ramble or instruct their children on how their numerous Fenton gadgets worked. However, this did nothing to stop Danny's curiosity that one day changed his life forever. While in his parents' laboratory, Danny had an accident involving the newly built "Fenton Portal", causing his molecular structure to be infused with ectoplasm.
As a result, Danny Fenton becomes a half-human, half-ghost hybrid; he styles himself as a new persona as Danny Phantom, an extraordinary spectral superhero with a ghostly array of other-worldly powers; able to shift between the forms his human-half and his ghost-half at will, coming into a number of various supernatural/paranormal extraordinary abilities.
Upon transformation, his normally black hair turns white, his eyes change from sky blue to ectoplasmic green, his skin changes from light to tanned, and his normal attire becomes a black JUMPSUIT suit - with white boots, gloves, belt, and starting from the second season, a "D" emblem with an inner "P" on his chest. The emblem is added by Danny's friend Sam Manson in "Memory Blank", where she is forced to relive the events leading up to Danny's initial transformation.
A friend of his since at least the second grade, Danny's friendship with Sam is not always as strong as the one he has with Tucker, in part due to their mutual stubbornness and in part to differences of opinions on matters, but he values her friendship just as much as he values Tucker's. The two held mutual feelings for each other, but Danny's constant ghost fighting kept these on the sidelines and unexplored. Throughout the entire series characters such as Dash, Ember, Tucker, Mr. Lancer, and even his own parents have called them a couple, which both of them deny any such feelings despite their real feelings surfacing at various points, such as their two "Fake Out Make Outs", used as a cover to distract people. Although they had their moments of distance from each other, as the end of the series approached the two began to realize their own feelings for each other, finally admitting such to each other in Phantom Planet. In the original concept for the show, Danny and Sam were supposed to have a psychic connection, but this was abandoned with the only elements of it being mutual reactions to certain situations and their shared dream in "Frightmare".
Paulina is highly well known for being the most beautiful and popular girl Casper High School. Originally, Danny had a crush on Paulina alongside many other students at Casper High School, but Paulina held no romantic feelings for Danny and viewed him to be a loser and nobody. However, Paulina had secretly harboured romantic feelings for Danny's alter ego, Danny Phantom and builds a shrine of him in her locker and shows only interest in him. Throughout the beginning of the series, Danny tried numerous attempts to win Pauline's affections and attention most notably in the episode Paternal Bonding. Later in the series during the episode, Lucky in Love, Paulina had discovered Danny's secret identity and they become a couple. However, Danny later comes to learn that Paulina is being inhabited by Kitty to make Johnny jealous and Danny manages to make Kitty leave and help Paulina. Since then, Danny begins to lose interest in Paulina and no longer has a crush on her as later develops feelings for Valerie and eventually when he finally and fully realizes his true romantic feelings for Sam.
Valerie Grey is a ghost hunter, seeking to destroy Danny Phantom and other ghosts she encounters, blaming them for ruining her life. However, she later begins to develop a friendship and eventually harbours romantic feelings for Danny Fenton, unaware that he and Danny Phantom are one and the same person.
- Sam and Tucker were originally the only people aware of Danny's secret identity as Danny Phantom. Later in the series, his older sister Jazz Fenton also comes to learn Danny's secret later in the first season, but doesn't reveal her knowledge until the second season. Danny's main nemesis, Vlad Masters/Plasmius also comes to learn Danny's secret. Eventually, by the end of the series, Danny reveal his secret identity to the whole world in the series finale, Phantom Planet.
- Danny wants to become an astronaut.
- Prior to finally discovering Danny's secret, there have been several times where Danny's parents learned the truth before the series finale, The Ultimate Enemy, Reality Trip and Masters of Time.