These are hard to implement technique, because they're meant to "control" someone else's character, and that is technically godmodding in this RP. We can make rulings to simplify them, but I'm unsure if you'd like to change them that much. For example:
Jibakugan:
We can play with the notion of incomplete genjutsu, by letting the brain's innate plasticity to complete the illusion. This technique could appeal to the cerebal cortex responsible for thought and emotion processing, creating a strain in the brain that appeals to the user's negative emotions. What this results is making the opponent view the world in a sad and hateful manner, which makes them more susceptible to verbal and freeform manipulation. The user does not have to know what makes the opponent sad, or even events in their past that would make them feel such emotions, but one can impose a "Truthful" clause in the sense that, anything related to trauma, sadness and general hatefulness must be portrayed and declared to the user by the opponent. Like, mentioning the word "parents", "death", "enemies" etc will trigger a verbal diahrrea where the opponent reveals these intimate details of their character's history, for further manipulation.
Another thing that can be done is implement generic "manipulation" effects, like the user is so sad and hateful he's forbidden from using Defensive techniques, having to opt for Offensive techniques or damage dealing Supplementary techniques. His lack of proper rational thinking prevents the usage of chakra-efficient counter, thus the user is only able to counter a jutsu by using something 1 rank higher in elemental interaction ( like, the user can't neutralize a jutsu, A rank Fire vs B rank Wind, they have to overpower every jutsu that comes to them, within their capabilities ( S ranks can be neutralized ) ). And is more likely to take more damage in Forbidden technique usages.
Soulbane
We can do an incomplete genjutsu where we strain their facial recognition process, recreating a Prosopagnosia within the affected. The user does not need to know who their opponents perceive as enemies, because their brains complete the illusion themselves. Targets within this illusion won't be able to recognize people they perceive as friends, allies or relatively cooperative as such, and will instead shift to think of them as people to defeat at all cost. Because it's a perception genjutsu, they can see a friend as he is, they just don't perceive them as friends or someone they can ally with. This will invariably force a target to shift their attention away from the caster and towards their allies, either in the NW or summon allies, for example, throughout the duration of this technique. A clause can be made for paired partnership, where the user can select two targets that will be in a linked genjutsu where they'll first team up against common-enemies ( friends ) and then turn on eachother when successful.
Spoken Word:
Because this serves as an enhanced Interrogation, this can be used with knowledge of the target's history. The user will probe into the target's mind for events and emotions within the cahracter's psyche that he can use to manipulate. In my mind, this is a blank and dark room that, as the user continues to talk, will shift into giving illusions of the target's own psyche and story, to further implant the manipulation, for example, have the target see a baby and hold them in their arms, as he strikes an assailant with a kunai. While the baby could be part of the illusion, the assailant could be from a different memory, or even a generic memory. Due to the user's complete control of the illusion, one can shift the target between complete sensorial manipulation ( stasis, the target stands still trapped in their mind ) and selective sensorial manipulation ( where, if it benefits the user, the target's actions in their mind are mimicked in reality ). In the case I mention, a selective permission can have the target actually pull out a kunai in real life and attack an approaching ally, without the target ever knowing what he's doing. This means there's no actual metagame, because we're giving our targets a chance to react as they want, we're just selectively picking which actions are translated in reality as well, and that leads to partial manipulation befitting this genjutsu.
Jibakugan:
We can play with the notion of incomplete genjutsu, by letting the brain's innate plasticity to complete the illusion. This technique could appeal to the cerebal cortex responsible for thought and emotion processing, creating a strain in the brain that appeals to the user's negative emotions. What this results is making the opponent view the world in a sad and hateful manner, which makes them more susceptible to verbal and freeform manipulation. The user does not have to know what makes the opponent sad, or even events in their past that would make them feel such emotions, but one can impose a "Truthful" clause in the sense that, anything related to trauma, sadness and general hatefulness must be portrayed and declared to the user by the opponent. Like, mentioning the word "parents", "death", "enemies" etc will trigger a verbal diahrrea where the opponent reveals these intimate details of their character's history, for further manipulation.
Another thing that can be done is implement generic "manipulation" effects, like the user is so sad and hateful he's forbidden from using Defensive techniques, having to opt for Offensive techniques or damage dealing Supplementary techniques. His lack of proper rational thinking prevents the usage of chakra-efficient counter, thus the user is only able to counter a jutsu by using something 1 rank higher in elemental interaction ( like, the user can't neutralize a jutsu, A rank Fire vs B rank Wind, they have to overpower every jutsu that comes to them, within their capabilities ( S ranks can be neutralized ) ). And is more likely to take more damage in Forbidden technique usages.
Soulbane
We can do an incomplete genjutsu where we strain their facial recognition process, recreating a Prosopagnosia within the affected. The user does not need to know who their opponents perceive as enemies, because their brains complete the illusion themselves. Targets within this illusion won't be able to recognize people they perceive as friends, allies or relatively cooperative as such, and will instead shift to think of them as people to defeat at all cost. Because it's a perception genjutsu, they can see a friend as he is, they just don't perceive them as friends or someone they can ally with. This will invariably force a target to shift their attention away from the caster and towards their allies, either in the NW or summon allies, for example, throughout the duration of this technique. A clause can be made for paired partnership, where the user can select two targets that will be in a linked genjutsu where they'll first team up against common-enemies ( friends ) and then turn on eachother when successful.
Spoken Word:
Because this serves as an enhanced Interrogation, this can be used with knowledge of the target's history. The user will probe into the target's mind for events and emotions within the cahracter's psyche that he can use to manipulate. In my mind, this is a blank and dark room that, as the user continues to talk, will shift into giving illusions of the target's own psyche and story, to further implant the manipulation, for example, have the target see a baby and hold them in their arms, as he strikes an assailant with a kunai. While the baby could be part of the illusion, the assailant could be from a different memory, or even a generic memory. Due to the user's complete control of the illusion, one can shift the target between complete sensorial manipulation ( stasis, the target stands still trapped in their mind ) and selective sensorial manipulation ( where, if it benefits the user, the target's actions in their mind are mimicked in reality ). In the case I mention, a selective permission can have the target actually pull out a kunai in real life and attack an approaching ally, without the target ever knowing what he's doing. This means there's no actual metagame, because we're giving our targets a chance to react as they want, we're just selectively picking which actions are translated in reality as well, and that leads to partial manipulation befitting this genjutsu.