Danielle 'Dani' Fenton, sometimes referred to as "Dani Phantom", is an artificial ecto-plasm clone created by Vlad Masters using Danny Fenton's DNA.
Dani was to become Vlad's heir to his evil empire. Dani discovered Vlad's intentions and rebelled against him, forming a familial relationship with her "cousin" Danny, eventually leaving to explore the world.
Appearance
Since Dani is a genetic clone of Danny Fenton they share many of the same physical traits.
In her Ghost Form, Dani's hair glows snow white, becoming much longer and prone to movement. Her eyes glow green and her irises disappear. Her skin also becomes slightly darker then in her human form. She wears a black super suit with a white collar, gloves, and boots, and sports his logo across her chest. Her suit lacks any seams or tech-adhesives, since it was not originally a jumpsuit like Danny's, and was made to be her super suit from it's creation.