A more complex plot could be centered around a prophecy that involves both the Titans and RWBY universes. Characters from both sides would have to come together to either prevent or fulfill this prophecy. Along the way, they would face internal and external conflicts, as some might not believe in the prophecy, while others might try to use it for their own gain.
Another plot could involve a character from RWBY getting lost in the world of the Titans. They would have to figure out how to get back home while also dealing with the Titans' own set of problems, like the various villains and power struggles in that universe. This could lead to some interesting character development as they learn from each other's strengths and weaknesses.
One idea could be a crossover where the Titans characters end up in the RWBY world and have to adapt to the Grimm and Huntsmen system. Maybe they team up with Team RWBY to fight a new, powerful Grimm that's causing chaos across Remnant.
A plot where the relationship between the bride and the Titan she is married to develops in unexpected ways. They might start off as strangers, but as they face challenges together, like dealing with other Titans who are not accepting of their union, they grow closer and form a deep emotional bond.
One idea could be an OC who is a long - lost descendant of a Titan. They have powers that are dormant until a certain event in the story triggers them. This OC could then be caught between the warring factions of gods and Titans, having to decide which side to take or even trying to broker peace.
One idea could be a new student arriving at the school with a mysterious power that no one has seen before. This could cause both excitement and suspicion among the other students.
One idea could be a mercenary who is hired by a mysterious client to steal an ancient relic from Beacon Academy. He has to navigate through the various defenses and teams of Huntsmen and Huntresses.
A plot could involve an esports competition where teams from different kingdoms in the RWBY universe compete. The story could explore how the RWBY team overcomes rivalries and strategic differences. They might also have to deal with a mysterious hacker trying to disrupt the tournament.
Well, you could have a story where all the RWBY characters swap their semblances for a day in chibi form. Ruby with Weiss's glyphs, Weiss with Blake's shadow clones, Blake with Yang's strength, and Yang with Ruby's speed. It would lead to some really funny and unexpected situations as they try to go about their normal activities at school. Or perhaps a fanfiction where the chibi RWBY teams are transported to a world made entirely of sweets. They have to resist the temptation to eat everything while also finding a way back home. A third option might be a mystery plot. A valuable item has gone missing in Beacon's chibi - version campus, and the teams have to solve the mystery of who took it and why.
One idea could be a new character arriving at the battlefield with a unique semblance that changes the tide of battle. For example, a character with the ability to manipulate time in a small area, allowing allies to get in extra attacks while enemies are frozen for a moment.
One idea could be Noctis arriving in the RWBY world and having to learn about Dust and how to use it in combat. Maybe he teams up with Team RWBY to fight against a new type of Grimm that his unique skills are well - suited to defeat.
A possible plot for 'rwby the incredibles fanfiction' is that Syndrome from The Incredibles teams up with Salem from RWBY. Syndrome offers his advanced technology to Salem in exchange for her help in getting revenge on the superhero community. The RWBY characters and the remaining Incredibles then have to find a way to stop this unholy alliance. They might start by training together to combine their different skills. Ruby could teach Dash some new acrobatic moves, and Elastigirl could show Blake how to use her flexibility in combat more effectively.
Another plot could involve a race between different teams in RWBY to claim a powerful battleship. This battleship could hold the key to some great power or knowledge. Along the way, they face various challenges and obstacles, both from each other and from external forces.