In a fanfic, Dark Naruto could team up with Eragon. Dark Naruto's combat skills and dark chakra could be combined with Eragon's dragon - riding and magic abilities. They could face challenges like an ancient evil that has been awakened and is causing chaos in both their realms. This would lead to interesting battles and character development as they learn from each other.
One idea could be a story where Naruto discovers a dragon egg similar to those in the Eragon and Dragonriders universes. As he nurtures the egg, he starts to develop a connection with the dragon inside, much like how Eragon did. This could lead to Naruto having to learn new skills related to dragon riding and magic, while also facing challenges from his own world and the new elements brought in from the other two universes.
One idea could be that Naruto characters are transported into the Dark Souls 3 world. For example, Naruto with his high energy and determination could be seen as a sort of chosen undead. He might use his shadow clones in a unique way to fight the various demons and bosses in the game world. His chakra could be translated into a form of 'soul energy' in the Dark Souls 3 context.
When writing a Dark Naruto and Eragon fanfic, think about the personalities of the characters. Dark Naruto is often brooding and powerful, while Eragon is brave and idealistic. You can use these traits to create interesting interactions. For the setting, decide if it will be mostly in the world of Eragon or if there will be some parts in Naruto's world too. Develop a story arc that involves a common goal for both characters, like saving a kidnapped dragon or stopping a dark wizard who has some connection to Naruto's enemies.
One idea could be that Naruto is transported to the Godzilla universe. He could use his ninja skills to try and communicate with Godzilla or other kaiju. Maybe he'd attempt to use his shadow clone jutsu to confuse the monsters during a battle.
One idea could be that Naruto characters are summoned as Servants in FGO. For example, Naruto himself could be a Berserker with his never - give - up attitude and powerful chakra being translated into high - level stats. Sasuke could be an Assassin, using his Sharingan to detect and strike enemies stealthily.
A more serious fanfic could be set in a post - apocalyptic world that was destroyed by a combined force of villains from both Naruto and Bleach universes. Naruto and Ichigo are the last hopes. They meet and initially clash due to their different ways of fighting and beliefs. But they gradually learn from each other and combine their powers in a unique way to take on the remaining villains and try to restore their worlds.
One idea could be that Venom somehow ends up in the Naruto universe. Maybe a strange rift in dimensions brings Venom to Konoha. He could initially be seen as a threat, but Naruto, with his ability to see the good in people (or in this case, symbiotes), tries to befriend Venom. This could lead to some really interesting battles and storylines, like Venom helping Naruto against powerful enemies using his unique powers.
A fanfic could be written where Alita is reincarnated in the Naruto universe as a ninja. She retains her combat skills but has to learn how to use chakra. Naruto becomes her friend and helps her adapt. They go on adventures together, facing off against powerful enemies. Alita's unique fighting style would make her stand out among the ninjas, and together they could become a formidable team.
One idea could be that Deadpool somehow gets transported to the Naruto universe. He'd be really confused at first but then start causing all kinds of chaos with his unorthodox fighting style and fourth - wall - breaking humor. Maybe he'd try to team up with Naruto, thinking he could use some of Naruto's cool jutsu in his own battles back home.
Another concept could involve characters from Star Wars being brought into the Naruto universe during the time when Dark Naruto exists. For example, a Jedi like Obi - Wan Kenobi could try to understand and potentially redeem Dark Naruto, seeing similarities between the dark side of the Force and Naruto's own inner darkness. This could lead to an interesting dynamic as Obi - Wan tries to use his Jedi teachings to reach Naruto.