I don't know. He's based off of Autumn, and drawing him, I actually came up with some interesting ideas about him.
He is an immortal being, but he can die if his soul rots completely. If and when his soul rots completely, his fur will have turned completely dark and his eyes will have lost their last glint, because his fur and eyes in a reflection of his soul.
That gold color that his tail is, when he was born, his entire body was that color, if it tells you anything about how rotten his soul already is.
The lighter parts on the gold in his fur/leaf aren't also markings, they are supposed to be glints to show that the gold is shiny.
He is very vain and stuck up, and believes himself better than pretty much everyone else.
He doesn't believe that his changing fur color means anything, because he won't let himself believe there's still a single ounce of good in him, and he thinks that he has no soul and is truly evil already.
Lastly, he does not talk or make sound, because he believes noise to be "an ugly pollution in a beautiful world."