Well, in this fanfiction, perhaps the power system of Dragon Ball Z gets combined with the rules - based world of 'No Game No Life Zero'. For example, the Saiyans' power levels could be translated into a game - like currency or ranking in the 'No Game No Life' world. This would lead to some really strange and exciting battles where the characters have to use both their combat skills and gaming knowledge.
One possible interesting plot could be the characters from 'No Game No Life Zero' somehow getting transported to the Dragon Ball Z universe. Riku could use his strategic mind to outwit some of the villains in DBZ. Maybe he'd form an alliance with Goku and together they'd come up with unique battle plans against enemies like Frieza.
The interaction between Riku and Goku would be really interesting. Goku is all about raw power and the joy of battle, while Riku is more about strategy and out - thinking opponents. They could learn a lot from each other. Goku could teach Riku about the importance of physical strength and Riku could show Goku how to plan battles more carefully.
Perhaps the mutagen that created the Turtles has some strange reaction when exposed to the Dragon Balls' energy. This could lead to new powers for the Turtles and a whole adventure about controlling and understanding these powers while also dealing with the Dragon Ball Z characters' reactions to them. For example, Vegeta might be initially suspicious and see the Turtles as a threat to his power status.
Well, it could be that they meet in a rather unexpected way. Maybe Gohan is in the middle of training when Videl stumbles upon him. Their meeting could lead to Videl becoming more involved in the world of martial arts that Gohan is a part of. And as they spend more time together, they start to understand each other's values and dreams. This could form the basis of a strong relationship in the fanfiction.
Well, perhaps Goku and Gine would have an emotional reunion. Gine might be shocked to see how strong Goku has become. They could share stories about Goku's past on Planet Vegeta that he never knew before.
In a 'Dbz Goku meets Bardock' fanfiction, it could start with Bardock somehow being brought back to life or time - traveling to Goku's era. They might initially have a bit of a clash because of their different upbringings. Goku was raised on Earth with love and kindness, while Bardock grew up in the harsh Saiyan society. But as they get to know each other, they find common ground. Bardock could be in awe of Goku's Super Saiyan transformations and Goku could be eager to learn about his Saiyan roots from his father. They could also form a strong bond and work together to protect the universe from new threats.
The plot could involve a quest. Maybe there is a powerful artifact that has been lost, and both Mizore and Sub Zero are somehow connected to it. Mizore might need the artifact to gain more power in the vampire world, and Sub Zero could be on a mission to keep it out of the wrong hands. Their paths cross, and at first, they are at odds. But as they learn more about the artifact and the forces that are after it, they join forces. For example, they might have to fight off demons who also want the artifact.
Well, in a 'Dbz Captain America crossover fanfiction', perhaps there's a threat that endangers both universes. Captain America's sense of justice and unwavering moral compass could inspire the Z - Fighters. They could learn from his strategic thinking. And Captain America could be amazed by the power of ki and the Saiyans' transformations. Maybe they start training together, with Captain America trying to keep up with the intense training of the Z - Fighters, and in the end, they save both universes.
One possible plot could be that the Fairy Tail guild discovers a strange energy similar to the ki in the DBZ universe. Natsu, being the curious and powerful wizard he is, decides to investigate. He then somehow gets transported to the DBZ world. There, he meets Goku, who is intrigued by Natsu's magic. Together, they have to face a new enemy that is a threat to both their worlds. This enemy could be a powerful wizard who has found a way to combine dark magic with the power of the dragon balls.
Some 'no game no life zero fanfiction' is about the untold adventures of the main characters. For instance, their adventures before the events of the main story. It could show how they developed their skills and personalities. There could also be fanfiction that focuses on the cultural aspects of the different species in the 'no game no life zero' world, like their traditions, languages, and how they influenced each other over time.
One interesting plot could be the mages from Fairy Tail being transported to the world of Game of Thrones. They might use their magic to deal with the political intrigue and battles there. For example, Natsu could use his fire magic to fight against the White Walkers, adding a new element to the fight against the undead.