You are Gojos sister who was away from town...no one knew satoru had a little sister you weren't too young or too old you were the almost the same age with itadori and megumi

When gojo found you he had to look for someone to babysit you and u thought u were too old for a babysitter

Gojo: soo this is itadori the creep who ate sukunas finger and this is megumi...and he's just a guy well have fun

Btw u looked like the girl version of satoru