Ruby and Master Chief could be a great pairing. Ruby's enthusiasm and quick - thinking could complement Master Chief's stoic and strategic nature. They could learn from each other's combat styles and leadership skills during battles against the combined threats of Grimm and Covenant.
Yang and the Arbiter. Yang is a strong - willed and powerful fighter, and the Arbiter has his own set of honor - based combat skills. Their interactions could be really intense, especially when they have to face off against powerful enemies. They might start off not trusting each other but gradually develop respect as they fight side by side.
Weiss and Cortana. Weiss is intelligent and has a good understanding of technology in her own world. Cortana is an AI with vast knowledge. They could work together to analyze the strange phenomena that occur when the two universes collide, like figuring out how Dust and Halo's energy sources can be used together.
The Arbiter and Thor. Thor is a powerful Asgardian with his hammer and lightning powers, while the Arbiter is a skilled warrior from the Halo universe. They could fight side by side against a common enemy. Their different cultures and fighting styles would make for an exciting combination. Maybe Thor could teach the Arbiter about magic, and the Arbiter could show Thor some unique Covenant combat techniques.
One of the most interesting pairings would be Reinhardt and Pyrrha. Reinhardt is a knight - like character in Overwatch, and Pyrrha was a very skilled fighter in RWBY. They both have a strong sense of honor. Reinhardt could teach Pyrrha some of his combat techniques from the Overwatch world, and Pyrrha could show Reinhardt some of the unique fighting styles in RWBY. Also, Widowmaker and Weiss could be an unexpected but fascinating pairing. Widowmaker's cold - blooded assassin nature could contrast with Weiss' more noble upbringing, and they could learn from each other in terms of combat and strategy.
Naruto and Ruby would be an interesting pairing. Naruto's positive attitude and never - give - up spirit could mesh well with Ruby's determination. They could both inspire each other in combat and in their personal growth. Another good pairing could be Sasuke and Blake. Sasuke's brooding nature and his search for power could be contrasted with Blake's own past and her fight for equality. They could have some deep conversations about their motives and past traumas.
I think pairing Ruby Rose with a Volt Warframe would be really interesting. Ruby is all about speed and her scythe - wielding skills, and Volt is known for its speed - enhancing abilities. They could learn from each other's combat styles and become a super - fast duo on the battlefield.
I think Master Chief and Captain America would be an interesting pairing. Master Chief is a super - soldier in his own right from a high - tech future, while Captain America is a super - soldier from the past. Their different combat styles and values would create an interesting dynamic.
Ruby and Julian. Ruby is full of energy and has her powerful scythe skills, while Julian is a brilliant scientist in Genlock. They could have an interesting dynamic where Ruby is constantly amazed by Julian's inventions and Julian is in awe of Ruby's combat abilities and her positive attitude in the face of danger.
I think Rey and Ruby would make an interesting pairing. Rey is a powerful Force user and Ruby is a skilled Huntress. They could learn from each other's combat styles. Rey could teach Ruby about using the Force - like instincts in battle, and Ruby could show Rey how to use her Crescent Rose more effectively.
Definitely Superman and Master Chief. Superman has all his superpowers like super strength, flight, and heat vision, while Master Chief is a highly trained super - soldier. They could have an interesting dynamic, with Superman respecting Chief's combat skills and Chief being in awe of Superman's powers. They could work together to take on powerful enemies, like Darkseid if he somehow got involved in the Halo - Justice League crossover.
The Arbiter and Perrine - H. Clostermann. The Arbiter is a complex character from the Halo universe with his own code of honor. Perrine is a proud and strong - willed Witch. Their different cultures and values could lead to some great character development moments as they work together, whether they initially get along or not.