Another concept could be a fusion of the Dragon Balls and the concept of the 'Circle of Life' in The Lion King. Maybe the Dragon Balls are scattered across the Pride Lands and the characters from both universes have to work together to find them. In the process, they learn from each other's values. Simba could learn about the importance of constantly training and getting stronger from Goku, while Goku could understand more about nature and the balance of life from Simba.
Some ideas for Dragon Ball Z Gine fanfiction include a time - travel story. Gine could be brought to the present day by some time - traveling villain or device. Then she has to adapt to the new world while also using her Saiyan knowledge and skills to help the Z - fighters. Another idea is to focus on Gine's family. Write about her relationship with Bardock in more depth, or create a story about her extended family on Planet Vegeta that we haven't seen before. You could also do a story where Gine meets the other Saiyans who were resurrected, like Nappa and Raditz, and how she interacts with them.
A great fanfiction idea could be about the Dragon Balls being accidentally transported to the Naruto universe. This would cause chaos as various ninja clans try to get their hands on them for different reasons. Maybe Naruto himself would be the one to discover them first and he has to figure out how to use them or protect them from those with malicious intent. And of course, there could be some fun interactions between Naruto's friends and the Dragon Ball Z characters who come looking for the balls.
Another interesting concept would be Shallot getting lost in a different dimension within the Dragon Ball Z universe. He would have to find his way back while encountering strange new races and powers, and along the way, he might learn some valuable lessons about himself and his abilities. This could lead to him coming back to his own world as a much stronger and wiser fighter.
Well, for 'Ben 10 Dragon Ball Z fanfiction', a cool concept could be that Ben gets caught in a time - space rift that sends him to the Dragon Ball Z universe right when a new and powerful enemy is emerging. Ben has to quickly figure out how to use his Omnitrix in this new world while also trying to get back home. And perhaps some of the Dragon Ball characters are intrigued by the Omnitrix and want to study it, leading to some funny and interesting interactions.
One idea could be a fanfiction where Vegeta gets a completely new haircut as a part of a disguise during a mission on a new planet. Maybe he has to blend in with the locals who have a very unique and flamboyant hairstyle. Another could be about Goku getting his hair cut by Chi - Chi because she wants him to look more presentable for a family gathering, but then he discovers that his power level is affected in some strange way. And a third idea might be a story where Trunks experiments with different haircuts to impress a new love interest in his timeline.
One idea could be exploring the backstories of Bojack's henchmen in more detail. Maybe they had different motives for following Bojack that could be delved into. Another idea is to create an alternate ending where Goku and the gang have a more difficult time defeating Bojack, perhaps with some unexpected power - ups for Bojack's side.
One idea could be a crossover with the Naruto universe. Goku and Naruto could team up to fight a common enemy. Maybe they face an evil villain who has the power - stealing abilities like Cell and the ability to use powerful ninja jutsus. Another plot could be a crossover with One Piece, where Luffy and Goku have a friendly competition about who can eat more food and then end up having to work together to defeat a new threat at sea that has the strength of Saiyans and the deviousness of pirates.
Another idea is a fusion of the power systems. Maybe in the fanfiction, the Sacred Gears from Highschool DxD could be enhanced by the Dragon Balls. The Dragon Balls' wishes could be used to unlock new forms or powers in the Sacred Gears. This would create a whole new level of power - ups for the characters in Highschool DxD.
One idea could be to have Goku and his friends end up in the RWBY world. They could team up with Team RWBY to fight a common enemy. For example, the Saiyans' power levels would be a huge asset against the Grimm. Another idea is to have Ruby Rose gain the ability to use Ki like in Dragon Ball Z. This would change the way she fights and add a new dimension to her character.
One idea could be that the Soul Reapers from Bleach team up with the Z - Fighters from Dragon Ball Z to fight a common powerful enemy. For example, a new type of demon that has the ability to absorb spiritual energy like in Bleach and also has the strength and fighting skills similar to the villains in Dragon Ball Z.