The plot might involve a new threat emerging on the beach. For example, an alien who is attracted to the energy of the Z - fighters shows up. The fighters then have to protect the beachgoers while also trying not to cause too much destruction. Piccolo could use his powers to create a shield around the beach area to protect everyone.
Perhaps it's a more light - hearted fanfiction where the characters are just enjoying the beach in their own ways. Krillin could be building sandcastles, trying to outdo Gohan's elaborate creations. And Chi - Chi could be making sure Gohan doesn't get into any trouble while still having fun in the water.
One possible plot could be that in a world where Naruto characters co - exist with Dragon Ball Z characters, Naruto is so focused on his own ninja world problems that he completely overlooks the power and significance of the Dragon Balls. For example, villains from the Naruto world might accidentally stumble upon the Dragon Balls and try to use them without understanding their true power. Meanwhile, Goku and his friends are trying to retrieve the balls from this new, unaware threat.
One possible interesting plot could be that Super 17 gains new powers that are not in the original series. Maybe he discovers a hidden energy within himself that allows him to time - travel. This could lead to him trying to change key events in the Dragon Ball Z universe, creating all kinds of chaos and new storylines for the other characters to deal with.
An interesting plot could be that the tournament is secretly organized by an evil force. They have placed a curse on the fighters so that if they lose, they lose their powers forever. Goku and his friends don't realize this at first. As the tournament progresses, they start to notice something is wrong. They have to not only win their battles but also figure out how to break the curse before it's too late.
One possible plot for this fanfiction could be that Bardock's return is not a simple one. He might be brought back by some sort of time - travel or resurrection magic. His return could stir up old rivalries among the Saiyans. And as he tries to fit into the current Dragon Ball Z universe, he discovers a conspiracy that threatens not only the Saiyans but the entire universe. So, he has to fight against this conspiracy while also trying to reconnect with his son Goku in a more meaningful way.
Bulma is a likely main character. She's always been part of the group and would bring her intelligence and her gadgets to the beach setting. Gohan too, as he often gets involved in the group's adventures. His kind nature would make him a great character to have around on the beach, helping others and having fun.
One possible plot could be that Gohan somehow gets transported to Equestria. He might initially be confused by the magical and pony - filled world. Then, he could use his martial arts skills to protect the ponies from a new threat that they are unable to handle with their own magic. For example, a powerful dark magic - based villain arrives, and Gohan's strength and fighting techniques become crucial in the battle to save Equestria.
The plot could start with Cell having a change of heart after a near - death experience. Maybe he realizes the futility of destruction. Then he could start to learn about the values of the Z - fighters and try to fit in with them, while also using his powers for positive things like helping to train the younger fighters.
One possible plot could be that Naruto and his friends are facing a powerful new enemy in their world. However, this enemy has some sort of connection to the Dragon Balls. Goku and Vegeta sense the strange energy from Naruto's world and travel there using Instant Transmission. They then team up with Naruto and the others. Naruto is amazed by Goku's strength and ki abilities, while Goku is intrigued by Naruto's chakra and ninja skills. Together, they combine their powers to defeat the common foe.
A plot could involve Goku being transported to a future where all his friends are dead and the world is in ruins. The unknown circumstances that led to this and the feeling of helplessness could make him scared. He then has to figure out how to go back in time and prevent this future from happening, all while being afraid of what he might find out about how this came to be.
Maybe there's a rift in the multiverse that merges parts of the Dragon Ball Z world and the DC Universe. The Z Fighters and the Justice League initially think they are enemies due to misunderstandings. For instance, when Goku first meets Batman, Batman might mistake Goku's carefree attitude for recklessness. But as they gradually figure out the situation, they team up to close the rift and fight off threats that are emerging from the merged worlds.