Sukuna despite being starved in the womb grabbed onto strength with all 4 off his arms and never let go off it basing his entire identity around itt.sukuna’s power is simple yet be-nines his own two faced nature as his name implies as is the man himself the technique sounds simple yet contains multiple complexities.its core is to sever cut away people, ideals, constructs and also himself literally as he cut off his own fingers to pass into them becoming even less human and metaphorically as he tried too sever his own humanity to imolate himself he turned out looking like a monster because he rejected the fate off weak humans to die instead he consumed to grow strong his brother was but the first but it does not stop at people knowledge sukuna’s ability to learn something after seeing it once is a form of cannibalism of what one is showing him and of course most importantly to sukuna most likely himself this is not even the first time sukuna had eaten apart off himself to grow strong after all jujutsu views twins the same after all .finnaly sukuna’s domain his internal one to be exact his his open barrier domain is in all its majesty is simply what sukuna is on a surface level his innate domain on the other hand is a womb it gives were he resides waiting to be reborn stuck in a state off non growth a lot like the death womb paintings except sukuna is fully grown a curse feeding of his vessel like a parasite perhaps sukuna’s internal domain is a reference to his stunted growth the fact that he never grew beyond what he did in the womb or maybe like yujis domain was his home sukuna himself considers this place off unbirth his home maybe because he’s been like this for a 1000 years.
yuji could have turned out just like that he was primed to for a fact it is what he means when he says I am you. yet didn’t this is what upsets sukuna so viscerally yuji only doesn’t turn out like sukuna because of his brother who even in the womb had the opportunity to turn out like sukuna as even he notes that if it had been wasuke who had eaten him instead it is wasuke who would have turned out the monster and survived but he didn’t turn out like sukuna literally and would whether conscious or not would pass this on to yuji in a sense yuji offering sukuna away too keep living is a parallel to wasuke and sukuna themselves as once in the womb sukuna ate wasuke and forced him too keep living alongside him with sukuna acting and doing whatever he wants yuji offers to eat sukuna to keep going but this time with yuji at the helm and sukuna as the helpless one but unlike or rather sort of like at the beginning of his life sukuna refuses to be consumed and much like what should have happened at the beginning he dies instead of prolonging his life and in the cycle of consumption and battle
Source: r/Jujutsufolk · by /u/Dry-Use1261