The ninja skills of Naruto characters would be very useful in the Stargate Atlantis setting. Sasuke's Sharingan, for instance, could be used to quickly analyze new threats or understand the technology of the Ancients. Sakura's medical skills could be a great addition to the Atlantis medical facilities, especially when dealing with new types of injuries or diseases that they encounter on other planets. And Naruto's Rasengan could be a powerful weapon against the mechanical or alien threats in the Stargate Atlantis universe.
The Stargate Atlantis characters are used to dealing with advanced technology and alien species. They might initially be very curious about the RWBY characters' abilities that seem almost like magic in comparison. For example, Sheppard might be intrigued by Yang's ability to absorb and release energy with her punches.
Naruto could also be a sort of mediator between the werewolves and other factions in the apocalypse. His ability to make friends and his strong sense of justice would allow him to try and bring different groups together. He could use his jutsu to help the werewolves in their battles, while also learning from their ways of survival and their connection to nature. This would create a story where Naruto is not just a fighter, but also a unifying force in a chaotic world.
Naruto himself would be quite a handful in Little Witch Academia. His energetic and somewhat reckless nature might get him into trouble at the academy. But his determination to succeed and his ability to make friends quickly could also help him fit in. He might struggle with magic at first, but his ninja skills could be adapted in some creative ways to the magical tasks.
First, know both universes well. For a Stargate Atlantis crossover, you need to understand the technology, characters, and settings of Stargate Atlantis as well as the other universe you're crossing it with. Then, come up with a unique concept. Maybe it's a situation where the Atlantis team has to team up with characters from another show to defeat a common enemy. Keep the characters in - character. If you're writing a crossover with, say, Star Wars, make sure the Atlantis characters act as they would in their own show while interacting with the Star Wars characters.
Dark Naruto could fit in as an outsider. He would be very different from the magical beings in the Winx Club. His combat skills and dark energy would make him stand out. He might be initially feared or distrusted by the fairies, but his unique abilities could also be a great asset when facing a powerful threat.
Deadpool could be a wild card in the Blood Prison. He might use his regenerative abilities to survive the harsh conditions. For example, he could take on the prison guards without much fear of getting seriously hurt. His unpredictable nature would also throw off the normal order in the prison.
He would probably also bring his ninja values with him. In a world full of power - hungry devils and angels, Naruto's values of friendship, hard work, and protecting the weak could have a big impact. For example, he might try to reform some of the more villainous characters by showing them the value of these things. He could also form strong bonds with the main characters in Highschool DxD, like Issei, based on shared ideals of fighting for what's right.
Naruto characters could bring their unique abilities. For instance, Sasuke with his Sharingan could easily detect hidden enemies or clues in the Assassin's Creed Odyssey environment. His teleportation - like jutsu would also give him an edge in combat and movement. Sakura, with her superhuman strength, could be a formidable fighter in the Odyssey world, perhaps joining the assassins' guild and using her medical ninjutsu to heal wounded assassins.
In a Naruto and Stargate Atlantis crossover fanfiction, one possibility is that Naruto's unique jutsu could be used in the context of the Stargate Atlantis universe. For example, his Shadow Clone Jutsu could be a great asset during battles against the Wraith. The Atlantis team might be initially skeptical but soon realize the power Naruto brings. Maybe Naruto could also learn from the advanced technology in Atlantis, like how to use Ancient weapons with his chakra.
A godlike Naruto would be a very powerful and unique addition to the Saints Row setting. His ability to move at super - fast speeds and his various jutsu like the Rasengan could make him a formidable force against the gangs in Saints Row. He could use his shadow clone jutsu to overwhelm enemies or his sage mode to sense danger and threats from afar. His presence would likely disrupt the normal power balance in the game's setting.