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 listening, by force, 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 infuse 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. In “Memory Blank”, Danny’s friend, Sam Manson, relive the events leading up to Danny’s initial transformation, adds the emblem.
He made his first appearance in "Mystery Meat"; he has had his powers for a full month, but did not tell his family out of fear of what their reaction would be. He also has little control over his powers at this early stage, as shown when he accidentally phases halfway through the floor at school. After a battle with the ghost of the evil Lunch Lady, Danny decides not to tell his folks and starts his long road of becoming a superhero to the people of Amity Park.
In "Bitter Reunions", Danny met Vlad Masters, a millionaire bachelor and Packer's fanatic who went to college with his parents. Vlad became his primary arch-nemesis throughout the series, possessing the same half-ghost powers he does, only twenty years more experienced and with very different intentions.
For the majority of the earlier episodes, Danny Phantom was not particularly a well-known ghost. His major comeuppance in the Amity Park's public eyes came in "Public Enemies" when Walker, a ghost cop, took revenge on Danny by ambushing the entire city, going as far as possessing the mayor, and framing Danny Phantom for all of it, causing the public to shun the ghost boy.
To make matters worse, when Freakshow took control of Danny with his crystal ball staff in "Control Freaks", he forced him to lead a series of ghostly bank robberies. Since then, Amity Park’s local authority have consistently chased after Danny, despite his intentions to bring about good to the world. He had only his two friends, Tucker Foley and Samantha "Sam" Manson, and his sister Jazz (secretly) supporting him. For a brief time,Paulina also knew and was helping him after she fell in "Lucky in Love" when he saved her and she found out his secret identity. However, it turned out that Kitty had overshadowed Paulina and when Kitty left, Paulina did not remember anything.
Becoming A HeroEdit
He managed to succeed in "Reign Storm" when he fought against the evil ghost king, Pariah Dark and managed to lock him back in his palace. Because of this blatant heroism, 64% of the townsfolk of Amity Park now saw him as good and as a hero. Since then, his popularity has soared, many knowing whom he is, some respecting and looking out for him, etc. Danny also confirms to the whole town at this point that his true name is "Danny Phantom" and not "Inviso-Bill". This also helps his standing in the Ghost Zone, asFrostbite, because of his actions; now call him, “The Great One” and “Savior of the Ghost Zone”. However, of course, the three people he needs to believe in his goodness: his parents and his at-the-time love interest, Valerie, who secretly became a ghost hunter and used Vlad's technology to hunt Danny, still did not believe Danny Phantom was anything but a menace.
In "The Ultimate Enemy", Danny witnessed an alternate future: after cheating on the CAT (Career Altitude Test), Danny's family, friends, and Lancer all die through a Nasty Burger explosion. Orphaned, Danny moves in with Vlad, the only one who can understand his situation. Danny just wanted to have no pain after his experience. With a great deal of sympathy for the boy, Vlad honored his wishes and removed his ghost half from his human self. As a result, Danny's ghost half went rogue and split Vlad's human half and merged with his ghost self, resulting in the birth of Dan Phantom. After presumably killing his human self and blowing up Vlad's manor, he went on a ten-year world destruction tour. Danny does battle with his future self eventually and with the help of Clockwork, alters his future so that he can have a second chance to undo the damage he would have caused. Because Clockwork said he had given everyone else a second chance, he deserved one too.
Danny appears as a childhood friend to Tracy and Tricia
- Danny is also revealed in a future story to have a sister figure in Raina.
- Danny appears as a childhood friend to Tracy and has known her since they were kids.
- Danny's father Jack Fenton is responsible for creating the Ghost Zone and giving the plans to Ben Tennyson as well as accidentally creating Vlad Plasmius (unknowingly) as well as Danny, Tracy and Tricia's ghost halfs.
- A running gag between the two is that whenever the two team up the villain will comment that they are so much a like that they should be dating instead of with Sam Manson and Seamus Finnigan. Both have denied their feelings and always says they're just friends.
- Unknown to Tracy or Sam, Danny had a crush on Tracy for a while but now he sees her as a sister and is happy for Tracy and Seamus together.