I apologize for my ugly English.
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Appearance:

by me

Art by Fernelescent
Nature: The soul of a dead man in the body of a deer with a human face.
Name: Saater. It was a word he remembered from the first time he woke up in the Forest. Maybe it wasn't a first name, but a surname. Or maybe it was the name of his best friend or his cat.
Gender: Male. He has trouble adjusting to his deer form, so he avoids romance.
Age: Saater died as a human when he was 21 years old. He is now an immortal creature and is able to change his age at will: he can be old, an adult, or a fawn.
Sign: Possibly Pisces. Saater can't remember what day he was born when he was human, and he hasn't found any recognizable constellations in the sky in the Endless Forest.
Character Traits: He is very kind, trustful,, compassionate and empathetic, but carries a hidden pain in his heart. He suffers from bipolar disorder: sometimes he is active, cheerful and playful, sometimes he is melancholic and unsociable. Believes in God. Fatalist.
Theme and voice:
https://youtu.be/EFz6lXzcyFQ
Art:
https://toyhou.se/31417014.saater/gallery
Saater (we'll call him that) grew up with loving parents in a world similar to ours. He was thoughtful, empathetic, friendly but a little cowardly. Avoided conflict, loved poetry, philosophy and music. He had an older brother, weak from birth, who was seriously ill. Saater was very attached to him. Overcoming his cowardice, he always defended him and read poetry to him at home. Saater had true friends - schoolmates. They were almost inseparable. He liked one girl, but he was afraid to admit his sympathy for her.