Due to the name of her spell card, "Hanged Hourai Dolls," Hourai is often portrayed in fan comics hanging herself for various reasons.
While official sprites indicate that Hourai's appearance is identical to that of Shanghai, fan comics tend to differentiate it, frequently by giving her a bonnet instead of a hair ribbon, and/or by giving her an elegant red dress instead of the maid outfit worn by Shanghai.
Even though she has no official profile and has only made two appearances during gameplay (and even then only as a spell card that's not often seen by most players), she's somehow become a very well known character.