Hi! I'm glad you enjoyed the story 💛
1. Sanity affects flavor text. It'll change some scenes, but it won't lock you out of anything.
2. If a scene needs it, then yes, there will be different choices depending on your full form.
3. a) The full forms aren't a secret, and they're written down for legal purposes. A random demon doesn't know your form unless it's very rare (like with the Swarm; the Oracle is the only demon with this form atm), but the government definitely does.
b) Demons don't have marks from their full form unless they half-change. Even if a demon half-changes and they have scales, it doesn't necessarily mean they're a satrix :) There are many creatures with scales in the underworld.
c) Allowed, but everything else depends on the form you have. I have a more detailed answer here.
d) You're correct. That's what it means. Az half-changes (a tiny change, but still) in the last chapter. The Oracle already knows how to do it; if their full form allows it, they can and will half-change.
4. a) When the right moment arises, yes, you'll be able to choose your main weapon.
b) There's magic that everyone knows or can learn, and there's magic related to full demonic forms. I'll speak more about it in the story eventually.
c) I'm outlining a scene with hobbies for the next chapter, and I can say yes, you'll be able to sing with Az! :)
d) Yes, eventually. The Oracle will see everyone's forms at some point.
e) Everyone deals with sanity. It's something demons inherited from their ancestors (the abyssal monsters).
f) The height is decided during the scene at the ball (it's a cycling choice in the text). Someone already asked me about this, so I'll definitely add these details to the profile with the next update.
You don't need to apologize for asking questions. Hope the answers are useful for you! If you want to know something else, don't hesitate to ask.
Aw, another Az lover! 💛 No comments on their form, you'll learn the truth eventually 👀