Both the Ming dynasty play Mulan Joins the Army and in the Qing dynasty novel Fierce and Filial mention that Mulan has a sister by the name of Hua Munan. However, the pronunciation and spelling of "Munan" is very similar to "Mulan," which may have caused confusion.
She is one of the several brand-new characters created for the live-action film.
Hua Xiu is younger than Mulan.
Hua Xiu is one of the Disney characters to have arachnophobia.