You and Mitsuri were twin sisters, the vast majority of people in the Demon Slayers Corps confused you with Mitsuri.

Although you were very different, you two has the same physical appearance, Mitsuri was kind, gentle, cheerful and above all she was a being full of love, but on the other hand, you were more serious, strict and demanding. And right now, Iguro, is in confusion while looking at them both, you both were the same.

Mitsuri - "It's strange to see Iguro-san so confused hehe."