Ruby could also be a great candidate. Her natural leadership skills and her ability to quickly adapt to new situations would serve her well. Plus, her speed and agility could make her an excellent Pilot. She might even come up with new strategies for using the Titans in combat, inspired by her own experiences in RWBY.
Weiss might seem like an unlikely choice at first, but she has a lot of potential. Her knowledge of Dust and combat techniques could be applied to the Titanfall technology. She could also use her Glyphs in creative ways to enhance the performance of a Titan, for example, using them to boost the Titan's speed or agility.
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.
Ryan could also adapt well. He's always trying to be something he's not in the office. In the Twilight world, he could embrace the opportunity to be a cool vampire or a powerful werewolf. He might use his charm (or what he thinks is charm) to navigate the Twilight society.
Luna Lovegood. Luna has an open - minded and curious nature. She would be very interested in Sakura's world of ninjas. Sakura, in turn, would be intrigued by Luna's unique view of the wizarding world. They could have some really interesting conversations about different creatures in their respective worlds. Luna could also introduce Sakura to some of the more unique aspects of the wizarding world, like thestrals and nargles, while Sakura could tell Luna about the summonable animals in the ninja world.
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.
I think Naruto would be a likely candidate. He's always been adaptable and open - minded. His experience with the Nine - Tails and his own growth as a ninja would help him in the Persona 3 world. He would probably be eager to make new friends and form Social Links, and his positive attitude could be a great asset when facing the Shadows.
Definitely Ruby Rose and Master Chief. Ruby is the main character in RWBY, full of energy and determination. Master Chief is a well - known and iconic figure in Halo. Their different personalities and combat styles would create an interesting dynamic. Ruby's quick - thinking and agility could pair well with Master Chief's stoic and strategic approach in battles.
The characters from 'Attack on Titan' would have a mixed reaction to the 'Titanfall' technology. Some, like Armin, would be very interested in understanding how it all works. He would study the technology and come up with new strategies for using it against the Titans. Others might be more hesitant. Levi, for instance, might be skeptical at first but would eventually see the value. They would need to adapt to things like the energy systems, which are very different from what they are used to. They would also have to learn new combat maneuvers that are designed around the 'Titanfall' technology.
Taylor Hebert might be a strong candidate. Her ability to control bugs gives her a wide - ranging and somewhat unpredictable power. She could potentially use her bugs to disrupt Pennywise's illusions or to find him when he's hiding. Also, her experience with facing difficult situations in the 'Worm' world could give her an edge in dealing with Pennywise.
Ruby would be a likely candidate. She is the leader of Team RWBY and has an open - minded nature. She would be able to see beyond Godzilla's initial appearance as a threat and might try to communicate with it. Yang, with her fearless attitude, could also be part of the alliance. She is not afraid to face powerful opponents and would be willing to fight alongside Godzilla if it means protecting the world. Blake, given her experience with different species and her ability to empathize, could also be part of the group that tries to form an alliance with Godzilla.