(I'm sorry I don't have ideas-)

your Sanemi and genyas little sister and you were born with a disease that made you unable to walk Soo you relied on sanemi and genya

Sanemi :i hate this brat

Shinobu :Sanemi dont be rude to your sister

Mitsuri :come here little one walk to me ok

Tengen :Flashy

Rengoku : sHe look UMAI

Giyu : … Obanai : this bitch

Gyomei : poor soul .. I might just cry

Genya : I hate are little sister he can’t even walk