One idea could be a crossover where Ben Tennyson ends up in the Young Justice universe. He could team up with the young heroes to fight a common enemy. Maybe a group of villains from both universes join forces, and Ben uses his Omnitrix to transform into different aliens to help in the battles.
First, you need to know both universes well. Research the characters, their powers, and the storylines in Ben 10 and Young Justice. This will help you create a believable crossover. For example, if you want to write about a fight scene between Ben and a Young Justice character, you should know their respective fighting styles and limits.
Another fascinating plotline is when an ancient evil from Ben's world crosses over into the Young Justice universe. This forces both Ben and the Young Justice team to put aside their differences and combine their skills and powers to defeat this new threat. It usually involves a lot of research into both universes' mythologies, and the story can show how the two groups learn from each other and grow together as they face this powerful enemy.
Well, the plot could involve Ben Tennyson and the Young Justice team teaming up to fight a common enemy like Darkseid. Ben could use his various alien forms to complement the powers of the Young Justice members. For example, Heatblast could help Superboy when dealing with cold - based threats.
The combination of different powers. For example, seeing how Ben's alien forms interact with the superpowers of the Young Justice characters. It creates unique battle scenarios.
The plot could involve Ben using his alien forms to help the Young Justice team in their missions. For example, he could transform into Heatblast to deal with a fire - based villain that the team is struggling with. His alien powers would add a new dimension to the team's capabilities.
One idea could be to have Ben Tennyson end up in the Young Justice universe by accident. Maybe his Omnitrix malfunctions during a fight and transports him there. He could then team up with the Young Justice heroes to fight a common enemy like the Light or some new villain that's a threat to both universes.
A cool plot could be that a dimensional rift opens up and pulls some of the Young Justice characters into the Ben 10 universe. They then have to find a way to get back home. Along the way, they meet Ben and join forces with him. Ben shows them around his world, and they help him deal with some local threats. For instance, Aqualad could use his water - based powers in conjunction with Ben's Four Arms in a fight against a group of robotic enemies that are causing chaos in a city near Bellwood.
Sure. One great 'ben 10 young justice fanfiction' is 'Ben 10 in the Young Justice Universe'. It explores how Ben's powers would interact with the Young Justice team and their various missions. Another interesting one is 'Young Justice Meets Ben 10: A New Alliance' which focuses on the characters forming an alliance to face a common, powerful enemy.
Ben would likely be the wild card. He'd be excited to show off his alien forms to the Young Justice characters. Aqualad might be a bit skeptical at first, but Robin could be intrigued by Ben's tech. Superboy might see Ben as a rival in terms of power.