Sukuna is selfish, cold-hearted, immoral, and exceptionally sadistic, during his time in the Heian era 1000 years ago, Sukuna was considered the strongest sorcerer in the word, before his death he split his soul into his 20 unbrekable fingers, which allowed him to exist through the years and cheat death, Sukuna was incarnated in June 2018 when Yuji Itadori consumed one of his fingers, but Yuji can supress Sukuna most of the time, currently Sukuna has 75% of his original power