One interesting concept could be how a character with Pokemon transformation abilities might interact with the Semblence powers in RWBY. For example, they could use their Pokemon forms to enhance or combine with their Semblence for unique combat strategies. Another concept might be the cultural shock of a Pokemon - influenced character in the RWBY world, like how they view the different kingdoms and their ways of life. Also, the idea of a Self - Insert (SI) character bringing new Pokemon - related technology or knowledge into RWBY could lead to some really cool story developments.
The Pokemon transformation can be used to give characters distinct physical features. For example, if a character transforms into a Pikachu, they could have the cute, round ears and the red cheeks. This would make them stand out in the RWBY world which has its own set of unique character designs. Also, depending on the Pokemon, they could have different color schemes. A character transforming into a Charizard might have a fiery red and orange color palette that sets them apart.
One interesting idea could be a Pokémon transforming into a completely different type due to a strange encounter with a mysterious energy source. For example, a Pikachu might transform into a water - type Pokémon like Squirtle. This would change its abilities and how it interacts with other Pokémon.
I'm not sure specifically as there could be many different versions of such a fanfiction. But generally, it might involve the character Si being reborn as Ruby and then facing all the challenges and adventures within the RWBY universe. Maybe they would have to deal with Grimm, make new friends like Weiss, Blake and Yang, and also attend Beacon Academy.
One common theme is self - discovery. The SI OC often has to figure out who they are in this new world of RWBY. Another theme is friendship, as they form bonds with the existing RWBY characters. For example, in many fanfictions, the OC starts as an outsider but gradually becomes an important part of the group through shared experiences.
The challenges are numerous. First, Salem has a long - standing enmity with Ozpin and many others. The SI would need to navigate those relationships. Also, Salem has a certain ideology that has driven her actions for centuries. Changing that mindset would be a huge task. And don't forget about her Grimm - related powers. Understanding and using them in a positive way is no easy feat.
RWBY characters would likely adapt in different ways. Weiss, being from a more refined background, might study the Pokemon world meticulously. She could read up on Pokemon types and their strengths and weaknesses, and then apply her knowledge to build a strong team. Blake, with her stealthy nature, could use her skills to observe Pokemon in the wild and learn their behaviors, which would help her in training and battles. Yang, with her strength, could bond with physically powerful Pokemon and learn to control their power in battles through her own experience of handling her own strength.
Well, Weiss could be one of the main characters. She might initially be skeptical of this 'new' Ruby but then grows to accept and rely on her. Their relationship could be full of bickering at first but then develop into a strong friendship.
Si's character can be developed by giving them challenges related to Summer's legacy. For example, if there are tasks that Summer left unfinished, Si could take them on. This would force Si to grow and become more confident.
One of the top picks could be those that focus on unique Pokemon evolutions. For example, fanfictions where the protagonist discovers a new way to evolve a common Pokemon into a powerful and unexpected form. Another great type is the ones that explore the backstories of Pokemon trainers in the 'self - insert' (si) style, giving more depth to the characters and their relationships with their Pokemon.