Ryuga could also be a main character. His dark and mysterious nature would add an interesting dynamic to the crossover. He might initially be at odds with the beywheelz characters, but as the story progresses, he could see the value in working together. Plus, his powerful beyblade skills would be a force to be reckoned with in the new and different battles of the beywheelz world.
A cool plot could be that a new type of beyblade is created which combines the technology of beywheelz. A young and talented blader gets this new beyblade and is transported to the beywheelz world while testing it. In the beywheelz world, he has to prove himself in their battles to gain the trust of the beywheelz characters. Along the way, he discovers that there are dark forces in both worlds that are trying to steal this new technology for their own evil purposes and he has to stop them with the help of his new friends from both beyblade and beywheelz.
One interesting pairing could be Naruto and Tyson. Naruto's never - give - up attitude and Tyson's determination would make them a great duo. They could learn from each other's fighting spirits. Naruto could show Tyson how to use his environment and natural energy, while Tyson could teach Naruto some strategies from beyblade battles about anticipating an opponent's moves.
Zero and Ruby would be a likely pairing. Zero is a powerful and skilled fighter, and Ruby has a lot of potential and a unique weapon. They could learn from each other's combat styles. Ruby could learn about Zero's more serious and battle - hardened approach, while Zero could be inspired by Ruby's enthusiasm and creativity in fighting.
I think Ruby and a young, adventurous Pilot would make a great pairing. Ruby's enthusiasm and eagerness to learn new things would mesh well with a Pilot's daredevil nature. They could exchange stories about their respective worlds while fighting side by side.
Taylor Hebert might be a strong candidate. Her ability to control bugs gives her a wide - ranging and somewhat unpredictable power. She could potentially use her bugs to disrupt Pennywise's illusions or to find him when he's hiding. Also, her experience with facing difficult situations in the 'Worm' world could give her an edge in dealing with Pennywise.
Natsu would be a likely candidate. He's always up for a challenge and not afraid to take on powerful opponents. He'd probably be the first to rush towards Godzilla, either to fight it or try to befriend it in his own Natsu - like way.
Ash Ketchum would be a must - include. Imagine him using his knowledge of Pokemon to master Beyblade battles. Also, Gary Oak could be his rival in this new form of combat. From the Beyblade side, Tyson could be an interesting addition. He could bring his Beyblade skills and learn about Pokemon. And of course, Pikachu as a character - like presence in the form of a Pikachu - themed Beyblade would be really cool.
Hermione Granger. She's very curious and intelligent. When she sees Ghost Rider, she would be eager to learn about his powers and where he comes from. She might try to research in the Hogwarts library if there's any mention of his kind of being, and then try to communicate with him using her vast knowledge.
Magnus Bane and Doctor Strange would make a great pairing. They are both powerful magic - users. Magnus could introduce Doctor Strange to the magic of the Shadow World, and Doctor Strange could share his knowledge of the mystic arts from the Marvel Universe. They could collaborate on spells and magical defenses against common enemies.
Kabuto could be a likely villain. He's very intelligent and has a thirst for power. He could use his knowledge of jutsu and his ability to manipulate others to try and steal The Flash's speed force. He might think that by combining it with his own powers and ninja techniques, he could become invincible.