How To Get Videl In Dragonball Z Budokai 3?

Videl is the daughter of Hercules. She is a playable character only if you unlock her. To do so you need to trigger the "Videl" event.

While in Gohan's DU mode and before the battle of Dabura, go to Goku's house and then go east to the fields located near his house. If everything is done as said then you will trigger the first event with Videl in the fields. After the cut scene is over search the lower right portion of the Island on the Map. Keep searching till you find a spot on the island once you find the spot, walk over it and it should trigger a second conversation with Videl. The conversation will be about Videls training, once the cut scene is over Videl will be unlocked as a play able character in the game.