Ben and Frankie Stein could be a really interesting pairing. Ben, with his ability to transform into various aliens, is always ready for action and adventure. Frankie, on the other hand, is intelligent and curious about the world around her. They could work together to solve problems that arise from the crossover. Frankie might be able to analyze the Omnitrix technology, while Ben could protect her from any immediate danger using his alien forms.
Gwen from Ben 10 and Draculaura from Monster High could be an interesting duo. Gwen has her magic powers, which are somewhat different from the abilities of the Monster High students. Draculaura, as a vampire, has her own set of unique powers. They could bond over their differences and similarities. Gwen could help Draculaura understand the magic in Ben's world, while Draculaura could introduce Gwen to the unique social dynamics and cultures at Monster High.
Four Arms and the werewolves at Monster High would make for a great pairing. Four Arms is all about strength and combat, and the werewolves in Monster High also have their own kind of strength and pack mentality. They could either be rivals, constantly trying to outdo each other in feats of strength, or they could team up against a common enemy. Their interactions would be full of energy and testosterone - fueled challenges.
Ben and Issei would be an interesting pairing. Ben is used to being a hero with his Omnitrix, and Issei has his own journey of becoming a powerful devil. They could learn from each other's combat styles. Ben could show Issei how to use his alien forms' unique abilities in battle, and Issei could teach Ben about the world of devils and the importance of relationships in his world.
Definitely Ichigo and Ben. Ichigo has his strong sense of justice and his powerful Hollow - Soul Reaper abilities. Ben, on the other hand, has the Omnitrix with all its different alien forms. They would make an interesting duo as they could learn from each other's fighting styles and powers. Ben could learn about the spiritual aspect of Ichigo's powers, and Ichigo could be amazed by the physical transformations Ben can do.
Ben and Ruby would be an interesting pairing. Ruby is young and full of energy, always eager to learn and improve. Ben, with his experience using the Omnitrix, could teach her a lot about adapting to different situations. And Ruby could show Ben the importance of teamwork in her own unique way.
One of the most interesting pairings would be Ron Weasley and Clawdeen Wolf. Ron is known for his loyalty and his love for food, and Clawdeen has a strong sense of family and a passion for fashion. They could have some hilarious interactions as Ron tries to understand Clawdeen's fashion choices while she tries to get him to appreciate the importance of family in Monster High. Also, Severus Snape and Lagoona Blue could be an unexpected but fascinating pairing. Snape's brooding nature and Lagoona's laid - back attitude could create some really interesting dynamics as they work together to overcome a common threat in a crossover scenario.
Ben and Luke Skywalker would be a really interesting pairing. Luke is a powerful Jedi, and Ben has the power of the Omnitrix. They could learn a great deal from each other. Luke could teach Ben about the Force and self - control, while Ben could show Luke how to think outside the box when it comes to combat with his various alien forms. Another interesting pairing would be Ben and Han Solo. Han is a scoundrel with a lot of street smarts, and Ben could use some of that practical knowledge. Plus, Han would be fascinated by the Omnitrix.
For me, Ben and Han Solo would make a really cool pairing. Han is a scoundrel with a blaster, and Ben has his array of alien powers. They could get into all sorts of adventures together, like smuggling something important across the galaxy while being chased by the Empire. And another good pairing could be Ben's alien form, Swampfire, and Chewbacca. They could both use their physical strength and unique abilities to fight in battles, Swampfire with his plant - based powers and Chewbacca with his brute force.
Ben and Natsu would be an interesting pairing. Natsu is all about fire and brute strength, while Ben has the ability to transform into various aliens with different powers. They could have a friendly rivalry, like who can defeat an enemy faster. Ben could show off his alien forms to Natsu, and Natsu could teach Ben some fire - based magic tricks in return.
Another interesting pairing could be Kevin from Ben 10 and Byakuya. Kevin has his unique powers related to absorbing and manipulating energy, which could contrast with Byakuya's refined and traditional Soul Reaper skills. They could start off as adversaries, perhaps misunderstanding each other's motives, but then come to respect and work together as they realize they are facing a common threat that requires both their skillsets to overcome.
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.