One plot idea could be Spiderman getting transported to the DC universe and forming a harem of female superheroes who are initially skeptical of him but gradually come to respect and love him as they fight together against common threats. For example, he could team up with Wonder Woman, Batgirl, and Supergirl.
One plot idea could be that Naruto, through some sort of interdimensional rift, ends up in the DC universe. His unique abilities and personality attract a group of DC female characters, like Wonder Woman, Batgirl, etc. They form a sort of harem - like group around him as they are intrigued by his ninja skills and his never - give - up attitude. They then team up to face a common threat that is endangering both the DC world and Naruto's own world that is somehow connected through the rift.
One idea could be that Spiderman gets transported to the DC universe due to a multiverse glitch. He teams up with Batman to stop a villain who has stolen technology from both universes. Another could be that Peter Parker goes to Metropolis for a science fair and accidentally gets involved in a battle between Superman and Lex Luthor, using his Spidey - sense and skills to help Superman.
Maybe in this fanfic, there's a multiverse crisis that causes parts of New York in the Marvel universe to merge with Gotham in the DC universe. Spiderman and Superman meet and initially have a bit of a misunderstanding due to their different ways of handling things. But then they realize they need to work together to separate the two cities again. Spiderman could use his webs to help Superman contain some of the chaos while Superman uses his strength to move large structures that are in the way.
One idea could be that Spider - Man gets transported to the DC universe through some sort of interdimensional rift. He teams up with Batman to stop a new villain who has the powers of both Green Goblin and the Joker. Their combined detective skills and combat abilities would make for an exciting story.
One idea could be that Harry Potter and some of his friends are transported to the DC universe and they have to team up with superheroes to fight a common enemy. Along the way, they form a unique bond with the DC characters, creating a harem - like group where everyone has different skills and personalities that complement each other.
A possible plot could involve Naruto being mistaken for a new meta - human in the DC world. As he tries to find his way back home, he ends up in the middle of Gotham or Metropolis. His kindness and strength start to draw the attention of female characters. Superman's cousin, Supergirl, might see him as an interesting addition to the hero community, while Catwoman could be interested in his skills for more self - serving reasons. This creates a harem - like situation where Naruto has to deal with different female characters with different motives.
One idea could be that Ben, with his Omnitrix, somehow gets transported to the DC universe and meets various female characters. Maybe he has to team up with them to stop a common threat, and during the adventure, relationships start to form. For example, he could work with Wonder Woman, and she is initially skeptical of his powers but grows to respect him.
One idea could be Ben Tennyson getting transported to the DC universe and his Omnitrix's powers attracting the attention of various female characters. For example, Wonder Woman might be intrigued by his unique abilities and his sense of justice. Another could be that he teams up with some of the female superheroes to fight a common enemy, and during the process, a harem - like relationship starts to form.
One idea could be that Spiderman 2099 has to team up with a group of rebels from a future dystopia to take down a powerful corporation that controls the city. They might face advanced technology and dangerous enforcers.
There are quite a few out there. Some might focus on how Spider - Man interacts with different DC characters in a harem - like setting. For example, he could be in a world where he meets various female DC characters and forms unique relationships with them. You might find some really creative stories if you dig deep enough into the fanfiction community.