The self - insert could be a Grimm - human hybrid. They struggle with their identity, as they have the powers of a Grimm but the heart and mind of a human. This could create a lot of internal conflict as they are shunned by both humans and Grimm. They then have to find their place in the RWBY world, perhaps by using their unique abilities to help in the fight against the more malicious Grimm.
One idea could be that the self - insert character has a special ability to communicate with Grimm on an empathetic level. This could lead to some really unique storylines where they try to understand the Grimm's motives rather than just fighting them. For example, they might discover that some Grimm are being controlled by a greater, more sinister force, and they have to figure out how to break that control.
Your self - insert could be a transfer student from another kingdom with a completely different fighting style. This would lead to interesting interactions with the main characters as they learn from each other. They might introduce new weapons or combat techniques that the others haven't seen before.
Well, a possible plot in 'rwby controls grimm fanfiction' is that the whole team RWBY starts to experiment with Ruby's new - found ability to control Grimm. They could face moral dilemmas, like whether it's right to use the Grimm as weapons. Maybe they try to use controlled Grimm to gather intelligence about Salem's plans. Or, they could accidentally create a new type of Grimm - hybrid when Ruby's control goes a bit wrong during an experiment.
Perhaps a half - Grimm character is hunted by both Grimm and humans. The Grimm see it as an abomination, and the humans fear its power. The story could follow their journey to find a place where they can be accepted. They might encounter various characters from RWBY along the way, and their interactions could lead to different moral dilemmas.
One idea could be to create a Faunus character with a unique animal trait, like a bat Faunus with echolocation abilities. You could insert yourself into the story as this character and interact with the main RWBY cast. Maybe your character is a new student at Beacon Academy and has to face the challenges of discrimination from some of the other students due to being Faunus, while also trying to prove their worth in combat and academics.
You could insert yourself as a human knight. Picture this: you are part of the Stormwind army, and you get involved in the fight against the orcs. During a battle, you find a mysterious artifact that gives you special abilities. This leads you on a quest to find out more about the artifact's origin and how it can be used to save humanity from various threats like the Scourge or the demons.
A possible plot is that the self - inserted character has to deal with the Omnitrix malfunctioning. This could lead to unexpected and sometimes comical transformations. They might transform into a really weak alien in the middle of a battle or into an alien that is completely inappropriate for the situation, like a tiny alien when they need to be strong. As they try to fix the Omnitrix, they learn more about its inner workings.
One idea could be a character who is turned into a Grimm due to a failed experiment. They then have to struggle with their new form and inner Grimm instincts while still having memories of their human life. Another could be a human turned Grimm as a result of a dark magic spell, and they try to find a way to reverse it while being hunted by other Huntsmen and Grimm alike.
One plot idea could be that a female grimm has some sort of mutation that gives it the ability to communicate with humans. This causes chaos as the RWBY characters have to decide whether to trust it or not. Another idea is that a female grimm is the last of its kind and the RWBY team discovers that it holds a key to an ancient mystery in their world. Maybe it has knowledge about a long - lost weapon or a hidden place.
One idea could be that Hela, as the self - inserted character, tries to reform the Avengers from within. She could use her unique powers and knowledge of Asgardian lore to help them face a new, powerful enemy. Maybe she starts off as a suspicious figure but gradually gains their trust through her heroic deeds.
A good plot for Highschool DxD self - insert fanfiction might be that the self - insert character is actually a reincarnation of an ancient and powerful being. They start off not knowing this, but as the story progresses, they gradually unlock their past memories and powers. This could lead to them having to make choices between their new life in the Highschool DxD world and their old responsibilities from their past life.