Cursed Techniques in Jujutsu Kaisen are generally character-specific techniques that are unique to every person. These techniques typically develop within someone at around 6 or 7 years of age and can be thought of as a manifestation of the inner personality and thoughts of that person and, can be used either offensively or defensively. There are also always outliers, such as Junpei Yoshino who got his technique at 17.