The Phantom Twins: Season 1
20 parts Complete Danny and Dayla are twin brother and sister. One day they had an accident in their parents lab, causing them to become half-ghosts. Now with the help of their friends Sam and Tucker, they battle ghosts and deal with the pressures of high school. The first season of the Phantom Twins begin! (I DON'T OWN DANNY PHANTOM)
I have the same story on fanfiction.net but my name on there is mikaela2015