Hulk and Doppo Orochi would make for an exciting pairing. The Hulk's uncontrollable rage and immense strength against Doppo's years of martial arts training. Doppo might initially try to calm the Hulk using his skills, but when that fails, he has to use his grappling and fighting skills to hold his own against the Hulk. This could lead to a really intense and action - packed encounter.
Rock Lee from Naruto would be a great choice. His dedication to martial arts and physical combat would fit well in the world of Baki the Grappler. He could have some intense battles and learn new techniques from the Baki characters.
Black Widow and a sneaky, intelligent minion from the Overlord world would be cool. Black Widow could use her spy skills to outwit the minion, or they could end up working together for some strange reason. Maybe the minion has some information she needs to save the Avengers who are trapped in the Overlord world.
Definitely Ben Tennyson and Iron Man. Tony Stark's high - tech gadgets and intelligence would pair well with Ben's Omnitrix. They could exchange knowledge about technology and come up with some really cool inventions together. Also, Iron Man could probably upgrade the Omnitrix in some way.
Storm and Thor would be an amazing pairing. Storm has control over the weather, and Thor is the God of Thunder. They could create some truly epic weather - related attacks together. Imagine them combining their powers to create a massive super - storm to take down a powerful enemy. Also, Jean Grey and Doctor Strange would be very interesting. Jean Grey's powerful psychic abilities and Doctor Strange's magic could lead to some really mind - boggling interactions. They could explore different dimensions of the mind and magic together, perhaps even finding new ways to use their powers in combination.
I think Wolverine and Black Widow would make an interesting pairing. Wolverine's brute strength and regenerative abilities paired with Black Widow's stealth and combat skills would be a great combination. They could have some really cool fight scenes together, like taking on a group of bad guys in a dark alleyway. Wolverine could do the upfront slashing while Black Widow uses her acrobatic moves and gadgets to take out the enemies from different angles.
One possible plot could be that the Avengers are investigating strange energy readings that lead them to the world of Baki the Grappler. They discover that there are powerful villains in this world who are using grappling techniques combined with some sort of super - powered enhancements. Baki and his friends initially see the Avengers as threats but then realize they have a common enemy. Together, they train and exchange fighting techniques, like Captain America teaching Baki about strategy and Baki showing the Avengers some of his extreme grappling moves. Eventually, they face off against the combined forces of their enemies in an epic battle.
Sasuke and Black Widow. Both are complex characters with a dark past. They could bond over their experiences of loss and redemption. Black Widow might be able to teach Sasuke some new combat techniques, while Sasuke could show her some of his ninjutsu skills. It would be interesting to see them on a stealth mission together.
Eggsy and Iron Man would make a great pair. Eggsy is a bit more rough - around - the - edges and from a different background, while Tony Stark is a genius billionaire. They could bounce off each other with their different perspectives. Eggsy might be in awe of Stark's technology at first, but then start to contribute his own unique ideas, and Stark could be amused and intrigued by Eggsy's street - smart solutions to problems.
I think Loki and Mal would make a very interesting pairing. Loki is known for his trickery and Mal has her own devious side. They could either be at odds, constantly trying to out - scheme each other, or they could team up for some self - serving purpose. Their combined cunning could lead to some very unpredictable and exciting storylines.
Well, Yujiro Hanma is a top choice. His status as the 'strongest creature on earth' gives a lot of room for creativity. You can write about his past, his motives, and how he views other fighters. Then there's Kozue Matsumoto. As Baki's love interest, her role can be expanded in fanfiction, perhaps how she deals with the dangerous world Baki is in. And Jack Hanma, with his own struggles to surpass his father and his brother, is also an appealing character to write about.