Thanks for sharing your headcanon for Mal and Hadie. I love getting to know more about different people and their au. You could have rambled for hours, and I'd still read it all. XD
Are you still working on a different tale, and do you have any headcanon for that, or are you finishing the Fate Gift series before you tackle a different tale?
You're welcome! And that's very sweet, I'll also keep that in mind XD
I sporadically work on ADT. It's definitely not abandoned! There is just a lot more worldbuilding that goes into it.
If you're talking about Mal and Hadie, their relationship is similar but different to Fate's Gift, as in this universe Hadie didn't take on a parental role. He's still very protective of her, given the whole Isle situation, but they bicker a little more and Hadie doesn't have the same feeling of responsibility like he does in Fate's Gift, nor does Mal feel like he's the only "adult" she can turn too.
Also, in ADT Hadie doesn't have to hide that he has a little sister and tells all his friends about Mal. He's actually pretty good friends with Mirabel and Camilo (same in Fate's Gift!!) and Mirabel in particular can't wait for the day she gets to meet Mal.
As for any other headcanons, you'd need to be very specific XD There are so many characters, events, and of course having 2014 Maleficent while also making things darker in general, things are quite a big different than in canon and Fate's Gift