Hello again,
No it was very clear, i understood everything =) !
I think Godot doesn't have the same features, because what you explain can be done, but it's tedious. I never worked with Unity so maybe it's easier to setup.
Anyway, the fact that you included .aseprite files saved me, i paid the software, learn to use it, and edited the frames myself. I centered the character on every animations if necessary, and converted all frames to 128px*128x and re-exported every spritesheet.
Was a lot of work but now, things are so much easier on the Game Engine. You simply import them, and... done. Nothing else to do :) !
I finished Johanna but i'll do the same for the two other characters.
So far it looks amazing, you have a gift indeed. I'll also consider taking all your other assets to support you. By the way, any chance to have nw Bundle to includes other stuff ? Maybe a giant Bundle with all of your work ?