I only have vague knowledge of both series (seen the first season of Avatar, and a few episodes of FMA). So if there are any interesting hints that have been dropped, there is a large chance I've missed them 
But the story has introduced enough threads/questions to keep my interest for a while. The segments are a little shorter than I'm used to, but they come out fast enough that I'm not complaining (chapter size is also constrained by your feedback-driven plot points).
Other commentary:
I like how most of the characters have their own internal motivations.
I think that Nin hasn't dealt with the body-shock of being gender swapped (this can be explained as with 'purposefully not wanting to deal with it' plus 'not having the time/proper situation for it to truly sink in'). Or you can handwave it away and say 'magic helped her deal'.
-Terry
-----
"so listen up boy, or pornography starring your mother will be the second worst thing to happen to you today"
TF2: Spy
But the story has introduced enough threads/questions to keep my interest for a while. The segments are a little shorter than I'm used to, but they come out fast enough that I'm not complaining (chapter size is also constrained by your feedback-driven plot points).
Other commentary:
I like how most of the characters have their own internal motivations.
I think that Nin hasn't dealt with the body-shock of being gender swapped (this can be explained as with 'purposefully not wanting to deal with it' plus 'not having the time/proper situation for it to truly sink in'). Or you can handwave it away and say 'magic helped her deal'.
-Terry
-----
"so listen up boy, or pornography starring your mother will be the second worst thing to happen to you today"
TF2: Spy