Hey Pir! Casii lives! I like her and I'm excited that someone finally made a yasoi character. I appreciate the amount of attention paid to their unique culture and lore and how you were able to play coy with their decline. Casii seems fun and complex and I see a good storyline ahead for her. Below are a few small amendments I'd like you to consider. Pending those, she's approved. Feel free to post her in the Characters tab and introduce her to the world.

1) "Should she find an interesting subject of fauna, she will take a few seeds and keep them with her." I think you're looking for 'flora'.

2) One of Great Gran's cognomens may need a touch of shortening. It's a bit of a mouthful.

3) Just a bit of a tonal thing, though I like her focuses: yasoi don't distinguish their magic as much between schools as they do between effects.

4) Yasoi aren't strictly arboreal. They just don't distinguish much between trees, hills, cliffs, etc. I love the image of them growing things right from the great branches of their trees, down the hillsides and cliffsides to the forest floor: all different sorts of plants that thrive in different light and watering conditions. 

5) Might use a different descriptor than 'meaty' for human noses from their perspective. It's all in the bridge of the nose and humans have much less of a bridge than yasoi.

Ultimately, those are mostly nit-picky little things. Casii looks great and I look forward to seeing her in the story!