Chat Noir would be a great pairing. Their different powers and personalities could create some really fun and exciting interactions. Chat Noir's flirty nature combined with Multimouse's more cautious approach would make for an interesting dynamic.
Ladybug herself could be an interesting character to pair with Multimouse. Since they are both Marinette in a way, there could be some really deep and introspective moments as they work together. They could learn from each other's strengths and weaknesses.
Rena Rouge could be a great addition. She and Multimouse could team up for a stealth mission. Since both have skills related to being sneaky and quick - thinking, they could make a formidable duo. They could also have some friendly rivalry which would add an interesting dynamic to the story.
Goku is a great character to pair with Beerus. Their relationship in the original series is full of tension and mutual respect. In fanfiction, they could have all sorts of adventures together, like exploring new galaxies or training in unique ways.
Catwoman could also be paired with Batgirl in fanfiction. They have an interesting dynamic as Catwoman is more of an anti - hero while Batgirl is a full - fledged hero. Their encounters could range from tense stand - offs to unexpected alliances as they both navigate the seedy underbelly of Gotham.
Chloe could be a great addition. She could be a supportive friend who helps Clana in their relationship, or there could be some friendly jealousy triangle situations that add drama. Another good character to pair with them could be Lex. His complex relationship with both Clark and Lana in the original show can be further explored in fanfiction, like how he might try to break them up or use their relationship for his own gain.
Another good pair could be Kakashi and Eminem. Kakashi is a very laid - back yet highly skilled character. His calm demeanor could contrast well with Eminem's energetic and often angry - inspired lyrics, leading to some unique exchanges and perhaps even Kakashi learning a thing or two from Eminem about expressing emotions.
Zane would also be a good choice. Zane's logical thinking could contrast with Aspheera's more emotional and power - hungry nature. Maybe he could try to reason with her and understand her motives better than the others.
In my opinion, Neville Longbottom could be an interesting character to pair with Percy and Harry. Neville has his own journey of growth in the Harry Potter series, and his courage could be a great addition. He could learn from Percy and Harry, and they could also learn from him. From the Percy Jackson world, Grover could be paired with them. Grover's connection to nature and his ability to sense danger could be very useful in their adventures together. Also, Luna Lovegood. Her unique perspective on the world could add a different dimension to their group dynamic.
Definitely Captain America. Their old - fashioned values and combat prowess make for an interesting dynamic. They can lead the team together in a fanfiction, with Wolverine's wild side balanced by Cap's discipline.
Darwin is a great character to pair with them. He's Gumball's best friend and also part of the family, so he can add a lot of fun and interesting dynamics to the story. Penny could also be a good addition. Her relationship with Gumball is unique, and in fanfiction, she can interact with Anais in new ways, like helping Anais with girl - related things. Richard, their father, can also be paired with them. His goofy nature can create some hilarious situations when combined with Gumball and Anais's adventures.
Brendan Conlon could be a great character to pair with Tommy. Their complex brotherly relationship can be further explored in fanfiction, like how they support each other during tough times or overcome past grudges.