The power - up moments. For example, when a Young Justice character witnesses a Saiyan going Super Saiyan for the first time. It's a moment of pure awe and it adds a new level of excitement to the story.
The power combinations. When you mix the super - powered characters from Dragon Ball Z with the diverse abilities in Young Justice, it can lead to some amazing scenarios. For instance, a character like Gohan using his ki blasts while working with Miss Martian's telepathy to take on an enemy.
I really like 'The Fusion of Two Worlds'. In this fanfiction, the technology in Young Justice's world and the ki powers from Dragon Ball Z are combined in a unique way. It starts with a strange portal opening up and the characters slowly getting to know each other's abilities. There are some great character interactions, like when Robin and Gohan start comparing their detective and martial arts skills.
The most exciting part is seeing the different power sets interact. Like Thor's lightning powers against Vegeta's energy blasts. It would be a show of raw power and strategy.
The most exciting part is seeing the different power sets interact. Sonic's speed and agility against Goku's super strength and ki blasts make for some really cool battle scenes.
The new storylines that can be created. For example, a new villain could emerge that requires the combined efforts of both the One Piece and Dragon Ball Z crews to defeat. This could involve battles in different settings from both universes, like fighting on the Grand Line and also in the Hyperbolic Time Chamber. It gives a whole new perspective to the existing story arcs of both series.
There are quite a few. You can check out fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'Dragon Ball Z Young Justice' on those platforms and you'll find a variety of stories, from crossovers where the characters meet and team up, to stories that explore how the power dynamics of Dragon Ball Z would work in the Young Justice universe.
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.
One possible plot could be that Thanos has somehow obtained the Dragon Balls. The Avengers team up with Goku and his friends to get the Dragon Balls back and stop Thanos from using them for his evil plans. They have to battle Thanos' forces while also dealing with the different power levels and fighting styles between the two universes.
I think Gohan and Martian Manhunter would make for an interesting duo. Gohan is a brilliant and powerful character who has a lot of potential. Martian Manhunter, with his telepathic abilities and shape - shifting, could teach Gohan new ways to use his powers. And Gohan could show Martian Manhunter the value of pure physical strength. Also, Trunks and Flash would be a cool pair. Trunks' time - traveling and sword - fighting skills combined with Flash's super - speed would create some really exciting action scenes. They could race each other or team up to outrun a powerful enemy.
A cool plot might involve a rift in space - time that pulls the Dragon Ball Z world and the DC Universe together. Vegeta could be at odds with Wonder Woman at first, seeing her as a rival in terms of strength and combat skills. The Justice League and the Z Fighters then discover that an ancient evil force from both of their universes' pasts has been awakened. They must learn to work together, with Gohan and Robin sharing their intelligence to figure out a plan. The Saiyans' transformation abilities and the Justice League's various powers like the Flash's speed would be crucial in the final battle against this evil.