In Jujutsu Kaisen season 2, Choso starts believing Yuji is his younger brother. But they’re not even related. So you might be wondering, why this is happening.
Choso isn’t a regular person. He’s this special being called a Death Painting Womb. Choso has two actual brothers named Eso and Kechizu. He cares about them.
But then Choso starts treating Yuji Itadori like he’s another brother. The thing is, Yuji has no family connection to Choso at all.
Well, it’s a theory that it all might be happening because of Kenjaku. He’s been alive for over 1000 years! He keeps putting his brain into different bodies.
And Kenjaku is actually Yuji’s mom. He put his brain into the body of Yuji’s mom before Yuji was born. And not just this Kenjaku is also Choso’s father. So Yuji and Choso are actually half-brothers. Kenjaku has big plans and Yuji is important for these plans. To make things work better, Kenjaku might change Choso’s memories, making Choso think Yuji is his little brother.
Another theory is Choso’s Blood Manipulation. Choso’s cursed technique revolves around blood manipulation. His ability to sense and control blood might have influenced the creation of the false memory.
Choso already loves his real brothers very much. When the fake memory comes to Choso’s head, all those strong feelings of love that Choso has for his real brothers now include Yuji too.
Kenjaku is really smart, he makes plans in his own way. It might be that he is manipulated his mind or it’s happened because of Choso’s Blood Manipulation. But this 2 is just theory’s there isn’t clearly conformed about this topic. But Choso really thinks of Yuji as his brother now. In the manga, their bond gets more strong.