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.
When it comes to Blake, Gilgamesh might see her as an interesting specimen. Her faunus heritage and her ability to blend into the shadows could either amuse or annoy him. He might try to use her as a tool to gain more knowledge about Remnant. Yang, on the other hand, with her brash and powerful fighting style, would likely be a target for Gilgamesh's taunts. He would challenge her to fights just to prove his own superiority, but Yang's determination might gradually earn his respect.
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 Stargate Atlantis characters are used to dealing with advanced technology and alien species. They might initially be very curious about the RWBY characters' abilities that seem almost like magic in comparison. For example, Sheppard might be intrigued by Yang's ability to absorb and release energy with her punches.
Ruby would be the most likely to engage with SCP fanfiction concepts in a positive way. She has an open mind and a sense of adventure. So she might see the SCPs as new challenges to face. Weiss would be completely against it. She values elegance and propriety in literature and SCP fanfiction doesn't fit that bill. Blake would look at the SCP concepts from a psychological angle. She'd wonder what makes people create such dark and complex entities. Yang would be all about the action. If there are strong SCPs in the fanfiction, she'd want to show them who's boss.
Weiss, with her more refined upbringing, could initially be a bit shocked by the differences in the Yamato's world but would soon start to find ways to use her skills. She might help with strategic planning, using her knowledge from Beacon Academy.
Hinata could befriend Ruby. Ruby is the leader of Team RWBY and Hinata is a key member of Team 8. They both have a sense of loyalty and a strong will to protect. Hinata could show Ruby some of her gentle fist techniques, and Ruby could introduce Hinata to Crescent Rose and how it works. Their friendship could be based on mutual respect for each other's combat abilities.
Ruby would likely be curious and excited. She'd probably see the Chaos Emeralds as a new source of power to help her in her battles. Weiss would be more cautious, perhaps seeing them as a potential threat to the order she values. Blake might be intrigued yet hesitant, remembering how power can be misused. Yang would be eager to test out their strength. For example, Ruby might try to incorporate the energy of the emeralds into her scythe attacks, while Weiss would be researching how to contain their power if it got out of hand.
Ruby would probably be very excited to meet Geralt. She might ask him a million questions about his adventures and his weapons. Geralt, on the other hand, would be more reserved but would respect Ruby's enthusiasm. Blake might be a bit cautious around the Witcher at first, but would soon be interested in his knowledge of different creatures. Yang would be eager to spar with Geralt to test her strength. And Weiss would be curious about the Witcher's magic and how it compares to her own Glyphs.
The characters would likely have an initial period of confusion. The Warframe Tenno, being used to their own high - tech battles, might be startled by the more 'primitive' but still effective weapons of RWBY. Meanwhile, the RWBY characters could be in awe of the Warframes' advanced abilities. For example, when a Warframe uses teleportation, the RWBY team would be both amazed and a bit suspicious. Eventually, they would start to work together, with the Warframes teaching the RWBY characters about advanced combat tactics and the RWBY characters showing the Warframes the ins and outs of their world.
He could be integrated as a powerful enemy at first. He might target the academies because he sees them as places that are trying to control and limit power, which goes against his own philosophy. However, as the story progresses, he could have a change of heart after seeing the selfless acts of the RWBY characters. He could then use his powers to help them against a common enemy like Salem.
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.