The introduction of new universes in the Tournament of Power was a huge plot twist. It brought in a whole new set of characters and challenges for Goku and his friends. They had to face opponents with different abilities and strategies, which made the story much more interesting.
In some fanfics, a great plot twist is when Goku discovers a new, hidden power within his SSJ 4 form. This power could be related to his Saiyan heritage in a way that no one, not even Vegeta, knew about. Also, there might be a plot twist where the Dragon Balls are used in a completely different way. Instead of just wishing for power or bringing back the dead, they could be used to change the rules of the Saiyan power - up system, which would have a huge impact on Goku's SSJ 4 form.
In a Dragon Ball fanfic where you're reborn, a great plot twist could be related to the Dragon Balls themselves. What if you're reborn as the guardian of the Dragon Balls? You could have the power to control who gets to make wishes and how. Another plot twist could be that you're reborn with the knowledge of all the different forms and techniques in the Dragon Ball universe, but you can't use them until you complete certain quests. And finally, it would be interesting if you're reborn as an android, but not like the ones we know. Instead, you have emotions and a conscience, which goes against what androids are supposed to be in the Dragon Ball world.
The introduction of new characters with unique abilities is a major plot twist. Characters like Jiren, who was extremely powerful and had a different fighting style compared to the usual Dragon Ball villains. His presence in the Tournament of Power made it difficult for our heroes. Also, the way the relationship between the angels and the Gods of Destruction was explored added an interesting layer to the plot.
The epic battles are the most exciting part. They are intense and full of energy.
One exciting plot could be that Goku and Naruto are brought together by some strange interdimensional rift. They initially misunderstand each other and get into a small fight. But then they realize they have a common enemy. An evil force is trying to collect the power of the Chakra and Ki to become all - powerful. So, they team up, with Naruto teaching Goku about chakra control and Goku showing Naruto some of his Super Saiyan forms and training methods. They then combine their powers in an epic battle against the evil force.
One interesting plot twist could be a character who was thought to be weak suddenly unlocking a new and extremely powerful form during the Tournament of Power. This form gives them an edge over stronger opponents and changes the whole dynamic of the battles.
One of the most exciting storylines is the Saiyan Saga. The appearance of Vegeta and Nappa, powerful Saiyan warriors, on Earth brings intense battles. Goku's fight against Vegeta especially is thrilling as they both push their limits. Another great one is the Cell Saga. The creation of Cell, an ultimate bio - weapon, and the Z - fighters' attempts to stop him are full of suspense.
One of the exciting plot twists is the appearance of new and powerful enemies. For example, the Kara organization. They have members with unique and dangerous abilities that pose a great threat to the Hidden Leaf Village and Boruto's world. Another twist is Boruto's own situation with the mysterious mark on his hand, which seems to be related to some dark secrets.
Hit is also a great new character. His time - skipping ability was a unique power in the Dragon Ball universe. He was an assassin with his own code of honor, which made his character complex and engaging. He had some great battles against Goku, and his fighting style was different from what we had seen before in the series.
The battles are the most exciting parts. Seeing Goku and Vegeta in new forms and using powerful attacks is always thrilling.