Ruby is a likely winner. She has her powerful scythe, great speed, and strong leadership skills. Her ability to quickly analyze a situation in battle gives her an edge. Weiss also has a good chance. With her Glyphs and powerful summoning abilities, she can control the battlefield. Blake is another one. Her speed and shadow - cloning ability make her a tough opponent. And Yang with her super strength and ability to take a hit and then counterattack fiercely could also be a top contender.
In my opinion, Pyrrha would be a very likely winner in a RWBY tournament fanfiction. She was already an extremely skilled fighter before her untimely death. Her martial arts expertise combined with her polarity semblance made her a force to be reckoned with. Another character could be Cinder. Despite being a villain, she has shown great power, with her ability to control fire and her strategic mind. Mercury and Emerald also have unique abilities that could potentially lead them to victory in a tournament setting.
Ruby is a likely candidate. She's already a skilled fighter with her scythe, and her eagerness to learn new techniques would make her adapt well to Santoryu. Her speed and agility could be enhanced with the three - sword style.
Ruby is often very memorable. Her enthusiasm and determination in the tournament are inspiring. She might show off some new skills or have some heart - warming moments with her team. Weiss could also stand out. Her growth in terms of her combat skills and how she deals with her family issues during the tournament arc can be quite engaging. Another one could be Pyrrha. Her strength and grace in battle, as well as her inner struggles, make her a character that readers can't easily forget in the context of the fanfic.
Ruby is an obvious choice as she has that lead - character feel. Her naivete and determination are traits that can be paralleled to Dorothy. She would be the one to lead the group through the strange world of Oz.
I think Weiss could also be central. She comes from a powerful family and has a lot of influence. In a story about watching the future, her knowledge of politics and her strategic thinking could play a big role. Also, her relationship with the other characters, especially Ruby, would be important in how they all react to what they see in the future. Blake might also be central as she has her own complex backstory and her views on the relationship between humans and Faunus could be greatly affected by seeing the future.
Yang Xiao Long could be a key character. Her brash and powerful fighting style might be pitted against the kind of foes from the Man of Steel universe. And Weiss Schnee, with her family's influence and her own ice - based powers, could also be in the spotlight. She might have to use her skills in a different context, perhaps in a more technology - heavy and super - powered environment like in Man of Steel.
Natsu would be a strong contender. His dragon slayer magic gives him great strength and endurance, and his determination to win would be unwavering.
Goku could be a likely ally. Despite their initial conflicts, Goku has a way of seeing the good in people. He might approach Broly and convince him that they can work together to win the Tournament of Power for their universe. Their combined strength would be a formidable force.
Weiss is also popular. Her ice - based powers and her growth from a somewhat uptight character to a more team - oriented one is interesting. In the tournament, her elegant fighting style and strategic use of her powers are always a highlight.
Yang could be a likely candidate. She's strong - willed and passionate. If she fell into a yandere state, she'd be very protective and possessive. Blake is also a possibility. Given her past and her somewhat reserved nature, if she developed yandere tendencies, she might be more subtle about it but equally as intense.
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.