I thought the elf theme for lifeweaver would make a lot of sense for his mythic, and even more the lotr elves, like thranduil and the clothes he wears.
Another thing that would be nice is if its possible to change some of his voice lines to sindarin, an elven language.
To the first level, the colors should be white, jade and gold, with an elven tiara with those same colors. The clothing should be long silk robes, that have details of elven pictures.
Second level should be a little color changed, with a light blue, sapphire and silver, to do a starlight kind of aesthetic.
Third level should be only for a change that adds the crown that thranduil uses, with details with jewels depending on the color. Also, this level changes the weapon to another one with details similar to the simarils.
Fourth level is the one that adds a more evil like color, with red, onyx and dark silver. Also, this level allows a tiara more complex with flowers and leaves. Finally, this level should add a different kind of robe, that has more details and has a glowing aura around.
This skin should also change how petal looks, adding to it some leaves and roots, looking more alive and more like a petal.
Also, the tree should look more detailed, looking like an elven tree.