Some fanfictions focus on a character - swap scenario. Imagine Ruby being in the body of Tracer and having to deal with the fast - paced, high - tech world of Overwatch while still having her own personality and some of her RWBY powers. Or Winston being in the body of a Beowolf and trying to figure out how to control the Grimm form while also using his own intelligence. This creates a really interesting dynamic as the characters have to adapt to new bodies and new environments.
One idea could be the Overwatch heroes being transported to the RWBY world. They could team up with Team RWBY to fight a new common enemy, like a powerful Grimm that is immune to normal attacks but vulnerable to Overwatch tech. Another plot could involve a character exchange, where a RWBY character like Ruby goes to the Overwatch world and learns about their technology and fighting styles, and then brings back new knowledge to her own world.
I think Mercy and Ruby would make an interesting pairing. Mercy is a healer in Overwatch and Ruby is the leader of Team RWBY. Ruby could learn about Mercy's advanced medical technology and how she uses it in combat. Meanwhile, Mercy could be inspired by Ruby's determination and leadership. Another great pairing could be Winston and Yang. Winston is a brilliant scientist and a powerful fighter as a gorilla. Yang is a brawler with a lot of strength. They could have some epic sparring sessions and also exchange knowledge about strength - based fighting and scientific inventions.
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.
Reinhardt and Yang would be an interesting pair. Reinhardt is an old - fashioned knight, full of honor and valor. Yang is a tough fighter with a bit of a hot - tempered side. They would likely start off butting heads as their personalities are quite different. But as they train together or face a common enemy, they would come to respect each other. Yang could learn about the code of chivalry from Reinhardt, and Reinhardt would be impressed by Yang's raw strength and her ability to keep fighting even when outnumbered.
A crossover could involve the characters swapping abilities. Imagine Tracer from Overwatch having the ability to call in a Titan like in Titanfall 2. Or a Titanfall 2 pilot having the ability to use some of the support abilities of the Overwatch heroes, like Mercy's healing. This would create really interesting and unique combinations in combat scenarios.
Another possibility is a story in which a character from RWBY is sent to the Naruto world and then later ends up in the Overwatch universe. They could bring their unique combat style and start training with the different groups in each world, like learning ninjutsu in Naruto and using advanced tech in Overwatch.
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.
One great Overwatch Bastion crossover fanfiction is 'Bastion in Another World'. It has Bastion being transported to a fantasy realm. The author does an amazing job of describing how Bastion's mechanical nature interacts with the magic of the new world.
The Mask's influence on the RWBY world might also change the appearance of things. If Weiss were to encounter the Mask, it could transform the elegant and icy settings she's used to into something more zany. The ice sculptures in her family's manor could start dancing around like in a wacky cartoon. And the Grimm, the dark creatures in RWBY, might react in strange ways to the presence of the Mask - perhaps they would be both terrified and strangely attracted to it at the same time.