This character's name is actually Nyrané, but due to e621 being unable to handle non-ASCII characters, this is her name.

Nyrané is a harpy character created by DiplomatReal out of a desire to draw harpies with more feathers on them than the typical anime precedent established by shows such as Monster Musume, as well as wings that are more accurate to how bird wings would actually look and function. She is a large, brown harpy with freckles on a lighter face, crimson hair, yellow scutes and purple talons, and is usually drawn wearing a large blue trench coat with gold trim. In her lore, she is accomplished in multiple types of magic in her lore. Despite this, she is a bottom and is drawn as such in most of her artwork.
She additionally has a heart-shaped pattern of lighter feathers on her backside, though this is a seasonal quirk and thus absent in a lot of her depictions.