Aurus/Appearance

Stick
Not much was mentioned regarding his appearance at this evolution. To him, he was just a normal stick. Nothing more. During some chapters in the book he refers to this stage as the twig stage.

Wind Walnut Branch
Compared to his stick form, his Wind Walnut Branch form was bigger in size, though it was mentioned how big the difference was. The color of his bark had changed to that of a slight ash gray. There were also a few green shoots growing out of his body. With the Fruit Creation skill activated, nuts would sprout out of his body. These nuts could take on two colors: pale green if he was using them as bullets, and ash gray if he was using them for storage.

Wind Walnut Spiritas
Compared to his Wind Walnut Branch form, his body was not made up of normal cells anymore, but rather a semi-intangible cell that held both his energy and soul. These cells are more commonly referred to as the Anima.

The Anima then rearranged themselves into a branch-like shape, transforming Aurus's appearance to that of a glowing green stick. With the Revitalising Anima Creation skill activated, Animas that glow a faint green color would hover around his body, maintaining a certain distance from him through a mysterious connection.

With the Form Morph skill activated, he could morph into any shape he could possibly think of, as long as it is not of an existence level higher than his current one.

Tempest Walnut Spiritas Flux
Compared to all of his previous forms, his current appearance leaned more towards that of a human, taking on the appearance of a rough wooden sculpture. Thanks to the Flux he had unlocked as a result of his evolution, he also looked like a smooth white marble sculpture. After upgrading Nine Flux Transformation to its peak, his appearance leaned more towards that of a jade sculpture instead of a marble one.

With the Form Morph skill activated, he could morph into any shape he could possibly think of, as long as it is not of an existence level higher than his current one.

Zephyr Spiritas Flux — Semis Regulus
He looks life a glowing green sculpture, a lot like his previous form.