The gamer could interact with Ruby by showing her the unique weapons that can be created with UBW. Ruby, being a weapon enthusiast, would be extremely interested. They might also team up during battles, with the gamer using UBW to support Ruby's scythe - based combat style.
The gamer with UBW would likely have a very dynamic interaction with the RWBY main characters. For instance, they could meet Ruby first while she's out on a Grimm hunt. The gamer's ability to quickly summon a variety of weapons with UBW would amaze Ruby. This would lead to an immediate connection as they both share a passion for combat and unique abilities. With Weiss, there could be some tension at first as she's used to a more structured form of combat and magic. But as the gamer shows how UBW can be adapted to different situations, Weiss would start to see the potential. Blake would be intrigued by the illusions and hidden aspects of UBW, and they could have deep conversations about the nature of power and identity. Yang would be excited to have a new sparring partner with such an interesting ability, and they would have a lot of fun testing each other's limits in combat.
One possible plot could be a gamer who gets transported into the RWBY world with the Unlimited Blade Works (UBW) ability. They could use their gaming knowledge to quickly understand the combat mechanics in RWBY. For example, they might recognize the patterns of Grimm attacks and use UBW to counter them effectively. They could also form alliances with the RWBY characters, teaching them some unique combat strategies from their gaming experience while also learning about the world of RWBY from them.
The main character is likely the gamer's OC. But other RWBY characters like Ruby, Weiss, Blake, and Yang might also be important characters as they interact with the OC in the fanfiction.
The main characters would almost surely include Ruby Rose, the scythe - wielding protagonist. She might have her skills enhanced in a way that relates to gaming, like having a leveling system for her speed or attack power. Weiss Schnee, with her ice powers, could also be a main character. Her abilities might be tied to some sort of mana or energy system like in games. Blake Belladonna and Yang Xiao Long would also be important, perhaps with new abilities or challenges related to the gamer - stand concept in the fanfiction.
Ruby could be really excited to meet Solid Snake and learn his stealth techniques. Snake, on the other hand, might be initially cautious about Ruby's over - enthusiasm but then come to respect her skills. He could teach her how to move more quietly and efficiently in a dangerous environment.
Gilgamesh would likely interact with Ruby in a rather condescending way at first. Since he's used to being the most powerful, he might underestimate her silver - eyed powers. With Weiss, he'd probably be intrigued by her family's status and her own ice - based powers, maybe trying to manipulate her into serving him.
Blake is often used in these fanfictions. Her stealthy nature could be utilized in a game where she has to infiltrate an enemy base within the game world. Her relationship with other characters also adds depth to the story when they're all involved in a gaming adventure.
Most likely, the main characters would be Ruby, Weiss, Blake, and Yang, as they are the central characters in RWBY. In the 'gamer fanfic' version, they would be the ones experiencing the game - like elements.
RWBY characters might initially be confused by Earthlings' lack of knowledge about Dust and Semblances. They could start by trying to educate some curious Earthlings about their world. For example, Ruby might show off her Crescent Rose to a group of engineering students, who are fascinated by its design.
The OC might interact with them in various ways. They could start by being in awe of their combat skills, like Ruby's speed. And in the harem aspect, they could show affection differently to each character. For Weiss, it could be through respecting her family name and helping her with her studies. With Blake, they might bond over books and their love for knowledge.
Sure, there are fanfictions like that. Some of them focus on the cultural differences between the two groups. The Avengers, coming from a more modern Earth - like setting, and the RWBY characters from their own unique world. How they communicate, misunderstand each other at first, and then gradually come to understand and work together is often a big part of these fanfictions.