One of the most interesting combinations would be Plagg and Grey Matter. Plagg's mischievous nature and Grey Matter's intelligence could lead to some really fun and unexpected situations. Grey Matter could come up with elaborate plans while Plagg provides his unique perspective and his ability to transform into a powerful weapon. Also, Rena Rouge and Diamondhead would be a great match. Rena Rouge's illusions and Diamondhead's diamond - hard body and ability to create crystal structures could be used in creative ways. For example, Rena Rouge could create illusions to distract enemies while Diamondhead sets up defensive crystal barriers or attacks from a distance.
A really cool character combination would be Hawk Moth and Vilgax. Hawk Moth's ability to akumatize people and Vilgax's thirst for power and his vast array of weapons and skills would be a terrifying combination. They could team up to take over both the Miraculous and Ben 10 universes. On the other hand, Tikki and Heatblast could also be an interesting pair. Tikki's positive energy and Heatblast's ability to generate and control fire could lead to some unique interactions. Maybe Tikki could help Heatblast control his power better or they could use their combined powers to defeat a powerful enemy.
I think Ben's Heatblast and Thor would be an interesting combination. Heatblast can generate intense heat and fire, while Thor has his lightning powers. They could create some really powerful elemental attacks together.
I think Spider - Man from the Avengers and Four Arms from Ben 10 would make an interesting combination. They both have enhanced strength and agility. They could have some really cool fight scenes together, and also some humorous exchanges. Four Arms' brute strength combined with Spider - Man's acrobatics would be a sight to see.
Ben as Diamondhead and Zoro would be really interesting. Diamondhead's crystal - like body could provide a great defense against attacks, and Zoro's swordsmanship could be enhanced with Diamondhead's sharp edges. They could team up in battles and create some unique combat strategies.
Ben and Star would be the most interesting combination. Ben with his ability to transform into different aliens and Star with her magic wand. They could combine their powers in unique ways. For example, Ben could transform into an alien that can fly and Star could use her magic to enhance its speed.
Ben's XLR8 and Beast Boy would be a great combination. XLR8's super - speed could be used in some really creative ways when paired with Beast Boy's ability to transform into different animals. For example, Beast Boy could transform into a bird and XLR8 could carry him at high speed, allowing them to scout out areas quickly or surprise enemies. Also, their personalities are both kind of fun - loving and energetic, so they would get along well and have a lot of banter back and forth as they fight together against the bad guys.
I think Ruby and Violet would be really interesting. Ruby is all about speed and combat, while Violet is more reserved and has the power of invisibility and force fields. Their different personalities and powers could create some really cool interactions. Ruby could learn about being more stealthy from Violet, and Violet could learn about being more assertive in combat from Ruby.
Erza and Captain America would be an amazing combination. Erza is a strong and disciplined warrior in Fairy Tail, and Captain America is the symbol of justice and leadership in the Avengers. Erza's various armors and combat skills combined with Captain America's shield and strategic thinking would make them a formidable team. They could lead the combined forces of Fairy Tail and the Avengers in battles against powerful foes, and also inspire the other characters with their unwavering determination.
Carly and Jade could be really cool together. Carly is sweet and friendly, while Jade is edgy and a bit of a troublemaker. Their interactions would be full of contrast. Carly might try to soften Jade a bit, and Jade could introduce Carly to a more rebellious side of life in Hollywood Arts.
I think the combination of the Doom Slayer and Anya Oliwa from Wolfenstein could be really interesting. Anya is a strong and intelligent character. She could provide the Doom Slayer with valuable information about the Wolfenstein world, like the layout of Nazi bases and their technology. Meanwhile, the Doom Slayer could protect her with his incredible combat prowess. This dynamic could lead to a story where they work together to uncover a deeper conspiracy that links the demons and the Nazis.
I think Yu and Joker would be really interesting. Yu is a calm and collected leader in Persona 4, while Joker is more of a cool and strategic leader in Persona 5. Their different approaches to leading their teams could create some great drama and cooperation.