Robson Menezes dos Santos is definitely a "Father of the Year" candidate. He spent six months to create a Dragon Ball animation for his son's birthday, replacing Vegeta, Trunks and Gohan with himself and his nine-year-old son.
It's really high quality for a fan-animation, highlighted below:
In the full clip — which is in Brazilian — he was also able to bring the original, Brazilian voice actors of Bulma and Goku round. They're basically saying "Happy Birthday" in portuguese to the kid in the first few minutes.
Otherwise, it seems Bulma's voice remains awesome in any translation.
Rasdael Z Kai by Robson Menezes dos Santos [YouTube]