Character: sothis (fire emblem)
Sothis is a major character in Fire Emblem Three Houses. She is a god who created the Nabatean race in ancient times, but fell dormant following her defeat during the Nabatean genocide. She shares a body with Byleth, the protagonist of Three Houses, and can fuse with them to grant them greater power.
Despite her age and power, Sothis takes the form of a child or young adolescent. She is a humanoid with green hair and pointy ears.