Takamiya_Shin
Here’s some world options because jjk power system is a lil broken already with him being a gojo I would suggest demon slayer for breathing techinques & sword forms, bleach for reaistu & zanpaktou or one piece personally I think one piece is the best he can grab haki a great grade sword maybe even a devil fruit but I wouldn’t do do the devil fruit I would focus on the physical aspect while he can make new moves for limitless