Maria Yagami is a character introduced in God Eater Online. She lived in the same orphanage (a facility for children who could be compatible with God Arcs) as the Protagonist when they were young. She was one of the oldest there and took care of the younger ones. However, they all died with the exception of her and the Protagonist.
She was devoured by an abandoned God Arc which the Protagonist tried to use, and appeared to them as a spirit.