Can someone tell me why my niece has become my Master?!
One casual remark from his niece forced a muscular man to become the heinous Ryomen Sukuna.
He has to play a good guy without going out of character, and make his niece happy without her noticing anything is wrong? Niu Niu! You're giving your uncle way too much credit!
And so, Sukuna's whole vibe changed...
“Shut up! I told you not to let me out so casually!”
Inner thoughts: Nicely done.
“Huh? Destroy humanity? I wouldn't do something that boring.” Sukuna folded his arms and looked calmly to the side. “No one can give me orders!”
Yuji: As if I'd believe you! [glares]
Megumi: ...What are you plotting? [frowns]
5t5: Don't believe a word he says, Yuji! [whispers conspiratorially into Yuji's ear]
Niu Niu's affection for him, from afar: -1, -1, -1...
Sukuna: Hey!! I am not plotting anything!! [breathes fire]
P.S. The author is a complete goofball, and the characterization is wildly out of character.
Theme: Sukuna's miserable life, constantly suspected after becoming a bona fide good guy