Paddy Conlon could be another good choice. In fanfiction, we could see how Tommy interacts with his father, perhaps trying to reconcile their differences and understand each other better, which could add depth to Tommy's character.
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.
One interesting Tommy Conlon fanfiction could be about his training journey before a big fight. It might focus on his daily struggles, how he overcomes his inner demons, and the relationships he builds with his trainers and fellow fighters.
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.
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.
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.
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.
Characters like Naruto from the Naruto series could be an interesting pairing. Naruto's positive attitude and his own powerful jutsu could be a contrast to Berserker's darker nature. Also, Captain America from the Marvel Universe would be a good match. Cap's leadership and moral compass against Berserker's more chaotic nature would create an interesting conflict. And for a more fantasy - based pairing, Legolas from The Lord of the Rings. His archery skills and elven grace against Berserker's brute strength would be a great visual and story - wise combination.
I think Mario and Hinata would be an interesting pair. Hinata's shy but strong - willed nature could contrast with Mario's always - positive and heroic attitude. And Mario could help Hinata become more confident in this cross - over scenario. Another good pair could be Toad and Shikamaru. Toad's small but brave self and Shikamaru's intelligence would make for an engaging dynamic.
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.
Sasuke could be a great addition. His complex relationship with Naruto already exists and adding Touka to the mix could create some really interesting dynamics. They could all be involved in a high - stakes battle against a new and powerful enemy.