Kirby and Yang could also make an interesting pairing. Yang is strong and brash, while Kirby is small but mighty. Their personalities contrast but could also complement each other well. Yang could provide the brute force while Kirby could use his unique powers to support her in battles, like when she's facing a particularly tough Grimm.
Ruby and Kirby would be an interesting pairing. Ruby is fast and has her scythe skills, while Kirby has his unique powers. They could both be the impulsive and eager ones in the group, always ready to jump into action. Ruby could be amazed by Kirby's ability to copy powers, and Kirby could be intrigued by Ruby's Crescent Rose.
I think Ruby and a young, adventurous Pilot would make a great pairing. Ruby's enthusiasm and eagerness to learn new things would mesh well with a Pilot's daredevil nature. They could exchange stories about their respective worlds while fighting side by side.
Zero and Ruby would be a likely pairing. Zero is a powerful and skilled fighter, and Ruby has a lot of potential and a unique weapon. They could learn from each other's combat styles. Ruby could learn about Zero's more serious and battle - hardened approach, while Zero could be inspired by Ruby's enthusiasm and creativity in fighting.
A cool plot might involve a dark force that is affecting both the RWBY world and Kirby's world. This force is causing strange things to happen, like Grimm starting to appear in Dream Land and some of Kirby's enemies showing up in Remnant. Ruby, Weiss, Blake, and Yang meet Kirby, and they initially don't understand him but soon realize his power. They work together to find the source of this dark force. Kirby uses his inhale ability to help them gather information by sucking up some of the smaller Grimm and enemies to learn more about what's going on.
One interesting concept could be the combination of Kirby's unique powers, like inhaling enemies and stealing their abilities, with the combat styles and semblances in RWBY. For example, Kirby might gain Ruby's speed semblance and use it in a creative way during battles in the RWBY world.
A pairing that has gained popularity is Rukia and Pyrrha. Rukia's cool - headedness and Pyrrha's kind - hearted and strong - willed nature work together well. Their friendship or potential romantic relationship can be a central point in many 'bleach rwby crossover fanfiction'. Additionally, some fans also like the idea of Byakuya and Glynda. Their no - nonsense attitudes and leadership qualities can be an interesting combination to explore.
All Might and Captain America could be a great pairing too. They are both symbols of hope and justice in their respective universes. They could share their experiences of leading and inspiring others, and work together to boost the morale of the combined teams during a tough battle.
Magnus Bane and Doctor Strange would make a great pairing. They are both powerful magic - users. Magnus could introduce Doctor Strange to the magic of the Shadow World, and Doctor Strange could share his knowledge of the mystic arts from the Marvel Universe. They could collaborate on spells and magical defenses against common enemies.
I think Harry and Blake could also be paired well. Blake's intelligence and her past experiences with the White Fang could be complemented by Harry's knowledge of fighting dark forces. They could bond over their shared experiences of fighting against those who want to bring harm and chaos, whether it's the Grimm in Remnant or Voldemort in the wizarding world.
Sans and Ruby are quite popular. Ruby's enthusiasm and Sans' nonchalant attitude can create a really interesting dynamic. They're both important characters in their respective worlds, so fans like to explore how they would interact.