Another interesting concept could be a character swap. Imagine Tracer from Overwatch in the Halo universe, using her time - jumping abilities in the middle of a large - scale Halo battle. Or a Spartan in the Overwatch world, trying to adapt to the more urban and team - based combat scenarios there.
Another concept could be a story where a character from Halo, say Master Chief, gets transported to the Overwatch universe. He has to adapt to the different rules and powers there while trying to find a way back home. Along the way, he could form unexpected alliances with Overwatch heroes and learn about their world, and they could learn from his military discipline and combat experience.
One interesting idea could be an Overwatch crossover with the world of Harry Potter. For example, Tracer could be a student at Hogwarts, using her time - traveling abilities in magical ways within the school. Another idea is a crossover with the Star Wars universe. Maybe Reinhardt as a Jedi, with his rocket hammer being a unique lightsaber - like weapon. And a crossover with the Lord of the Rings, where Orisa could be a guardian of a certain part of Middle - earth, protecting it from the forces of evil with her shield and gun.
Well, a cool concept for an Overwatch RWBY crossover fanfic would be to focus on the technology aspect. Overwatch has a lot of advanced tech, and RWBY has its own unique Dust - based technology. The fanfic could explore how the two types of technology interact. For instance, Mercy's healing staff could be affected by Dust in the RWBY world, or Torbjörn could use RWBY - style materials to upgrade his turrets. And of course, the character interactions would be great. Winston and Zwei could be an interesting pair to write about.
One idea could be to have the RWBY characters team up with Halo Spartans to fight a common enemy. For example, a new type of Grimm that has been enhanced by Covenant technology. The different fighting styles of the RWBY characters, like Ruby's scythe - wielding and Halo Spartans' high - tech combat maneuvers, would create some really cool action scenes.
One idea could be to have the Spartans from Halo end up in the RWBY universe. They could team up with the RWBY characters to fight against a common enemy like the Grimm. Maybe the Spartans' advanced technology would be a big advantage in battles.
Another idea is a story where the Covenant from Halo discovers the Force in the Star Wars universe. They might see it as a new form of 'holy' power and try to either harness it or destroy those who possess it. This could lead to some epic battles between the Covenant and the Jedi or Sith.
One plot idea could be Master Chief getting transported to the Marvel Universe. He could team up with the Avengers to fight a common threat like Thanos. His advanced combat skills and Spartan armor would add a new dynamic to the team. Maybe he'd be initially distrusted, but prove his worth in battle.
One idea could be that Master Chief gets transported to the Marvel universe. He teams up with the Avengers to fight a common enemy like Thanos who has somehow obtained Covenant technology. His Spartan abilities would be a great addition to the team.
One idea could be that the Master Chief from Halo is transported to the Destiny universe and has to team up with a Guardian to stop a new threat that is using technology from both universes. For example, the Covenant and the Fallen might be working together under a powerful new leader.
One idea could be an Overwatch crossover with the Star Wars universe. Imagine Tracer using her time - traveling abilities in the middle of a lightsaber duel. Another could be a crossover with the Harry Potter world, like Pharah flying on her rocket launcher over Hogwarts. And a crossover with the Marvel universe, where Reinhardt teams up with Thor to fight some powerful villains.