After chapter one, even if you have it turned off in the options, upon going into chapter two Seven shows on the screen anyway despite your settings.
While this may be a nonexistant issue for many readers, to someone as deathly pale as me it easily ruins the immersion, honestly even the fact she had a twin rather than just a brother could have done the same... However, thankfully, I'm aware it is possible to have twins from different fathers (though extremely rare, I know, the very fact of it allows me to imagine a rational reason behind it is enough.) But yeah... I hope the sprite issue will be fixed along with the next update.