Think about an alternate universe where the Naruto and Avatar worlds have been merged for centuries. There could be new clans that are a mix of both worlds' bloodlines. The plot could revolve around a mystery related to these clans and their hidden powers. And the 'lemon' part might come in when exploring the relationships within these new clans, like a Romeo - Juliet type of situation where characters from different 'halves' of the merged clans fall in love.
Mix the cultures. For example, if crossing with the Game of Thrones universe, combine the complex politics of Westeros with the four - nation system of the Avatar world. Maybe there's a power struggle over the Iron Throne, but the benders have their own influence due to their powers. Another way is to create a new threat that can only be defeated by the combined powers and knowledge of both universes.
By combining different worlds' rules. For example, if Naruto is banished to a world like Middle - earth from Lord of the Rings, his ninja skills like shadow clones would be very different from the magic there. It can create unique situations where he has to learn new powers or face new enemies. Also, his banishment can be a way to introduce a fish - out - of - water story, which always has potential for interesting plots.
First, think about the characteristics of the cards you want to cross over. If it's a monster card, consider the stats, type, and abilities. For example, if you're crossing a Winged Beast from the original series with a Machine - type from GX, you might give it the ability to fly like a Winged Beast but also have some mechanical enhancements. Second, look at the lore of both cards or series. You can base the new card's backstory on that. For instance, if a card has a story about an ancient power in one series, combine it with a similar concept from another series.
First, think about the Hellhound's characteristics. Maybe it has fire - breathing abilities or can teleport. Then, find a unique way to integrate it into the Naruto world. For example, it could be related to a new type of chakra. Also, create a strong plot. It could be a mystery where the Hellhound is the key to solving something big in the Naruto universe.
First, think about unique combinations of Naruto elements. Maybe mix the powers of different ninja villages in unexpected ways. Second, create new chimeric characters with distinct personalities. Third, design original chimeric jutsus. For example, combine the Inuzuka clan's beast - like fighting style with the Yamanaka clan's mind - control techniques.
You need to study the rules and characteristics of both universes. If you want to put a Naruto character into the Avatar world, think about how their existing powers would interact with bending. For instance, Kakashi's Sharingan might give him an advantage in seeing the flow of chi in benders. Also, give the characters a valid reason for being in the other world. Maybe a portal opened up, or they were sent there on a mission. This makes the crossover more believable.
A unique plot could involve the T - 3000 being reprogrammed by an unexpected force from the other crossover universe. This new programming could give it a whole new set of goals and morals, which would completely change its role in the story.
Combine different magic systems. For example, if crossing with the Magicians world, mix the Hogwarts magic with Brakebills' magic. The champions could struggle to adapt to new spells and incantations. Another way is to change the nature of the tasks. Instead of the usual tasks, make them more like a detective mystery where the champions have to solve a magical crime to progress in the tournament.
You could start with the idea that the Monopoly game is a training exercise created by a powerful ninja. The players have to not only win the game but also learn valuable ninja skills along the way. For example, if they pass 'Go', they gain a new jutsu instead of just getting money.
You can start by focusing on a side character from the original series and build their story in the future. For instance, Rock Lee's son could struggle with not having the same natural talent as his father but overcomes it through sheer determination and a new form of taijutsu training.