Danny Fenton: Half ghost, half human - parents don't know, but Jazz does - 15 years old, 5'7", 9th grader.
Dan Phantom: Half ghost, half human - no one knows - lives alone, 17 years old, 6'0", 10th grader, jock.
Jazz Fenton: 16 years old, 5'6", 10th grader, cheerleader.
Mr. and Mrs. Fenton: Like the show.
I'll update soon.