Prepare for a major brain-vomit on my part.
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He's a tall, lean humanoid with mottled pale green skin and digitigrade legs (like a werewolf's legs). His eyes are large and expressive, with yellow irises and black scleras (scleras are the 'whites' of the eyes), and primate-like paws (paws with opposable thumbs) on both his fore and hind limbs. His claws small but sharp, like a rodent's, and his mouth is full of long, sharp teeth. His fingers and toes are webbed, and he has a long prehensile tail (for balance when he walks on his hind legs and for grasping objects). His ears are long and rounded at the tips, like a rabbit's ears, and his hair is long and lank, a dark grayish-green color (he usually braids it). His face is stark white, with hollow cheekbones, a long nose, and a long chin. He has a long pair of horns that grow out of his forehead and curve slightly backwards, like a sickle chape.
His clothes are simple, typically a white shirt and brown trousers with suspenders, but he sometimes wears a poncho in rainy weather. He doesn't wear shoes.
He is the local forest spirit and generally a nice guy, just very socially awkward.