A spiritual duplicate created by Nefer (Genshin Impact) from Genshin Impact. Its form mostly resembles Nefer herself, except fully colored green, often with a Triangle Facial Mark.
The spirits are not counted as an independent being for the purposes of Solo, 1girl, 2girls, 3girls, etc. tags. So a pictures of Nefer and her spirit(s) with no one else should be tagged Solo.