Malfoid has gripped the collective imagination of the Harry Potter fanfiction community since its publication about a month ago. The concept of a female Draco Malfoy has exsited for a while, but this time the meme of Malfoid spread like wildfire. Seemingly every Harry Potter channel on Youtube has videos discussing how a female Draco Malfoy serving as Potter’s eventual love interest would fix the story. Such is the power of a well made, well timed, piece of art. See malfoid.com for some related fiction, or if you want to pour money into an AI that gender-swaps any male character (because, of course, such a thing has to exist in this era).
Drawing a tsundere with blonde hair and Makima eyes, and giving her a Slytherin gown and some sassy lines is one thing, but rewriting an entire series is quite a distinct endeavor. The solution to the Harry-Ginny relationship not working was to foreshadow it better. Have more development between them since the Chamber of Secrets days. Or set something up with Hermione and find another love interest for Ron. Granted that a Malfoid enemy-to-lover trope would make an interesting story, but the channels advocating for it underestimate how much would need to be changed.
The biggest ignored breaking change is the dilution of the tribal nature of the Hogwarts houses that it would create. It would hamper the clarity of feeling the reader is supposed to have for the enemy. Harry Potter is no Game of Thrones. The Death Eaters and their associates are the villains without question, and they should invoke the appropriate visceral reaction. Even having a female Draco, let alone one fitting the tsundere archetype, would undermine every contest or confrontation Harry and company have with Draco. Would Harry go as hard against Malfoid as he did against Draco? I suspect not. A lot of the story involves harboring deep suspicion and hatred towards Draco and his family. A love-interest to be would simply create confusion in Harry’s heart, and make him a less decisive character, which would make the books less gripping. (Remember who the target audience for the early books was.)
A lot of relationships would no longer work. Crabbe and Goyle would need to be changed. The sectumsempra scene would not work. Scenes with Snape and Malfoy would need significant reworking. A love-struck Malfoid slipping up on occlumency would complicate matters before Voldemort and Snape. Also bear in mind that Harry Potter is not a romance story. A Malfoid development might still feel rushed or undeveloped, and have the same problems that the dynamics with Ginny had. Malfoid would not ‘fix’ Harry Potter. It would, more likely, complicate and undermine it.