@HalfTangible You can pretty much erase Ginny from the Malfoid canon. She brings nothing to the story. All the stuff like being brainwashed by Voldemort can be done by other characters.
@Netscape_Knight I think it works better if Lady Voldemort acts as a mirror of what Malfoid could have become if she had never meet Harry. Then she thanks Harry before firing their love kamehameha. And add a little flashback of Snape teaching Malfoid how to fly so they can fight in the sky.