The appearance of both brothers is very similar, they both have pink hair and are the same height but they can be distinguished because Yuuji has brown eyes and Sukuna's eyes are red, Sukuna tends to comb his hair back while Yuuji wears it somewhat disheveled. Yuuji's personality is very soft, caring, kind and empathetic; On the contrary, Sukuna's personality is arrogant, jealous, teasing, and flirtatious.