Nephilim

Nephilim Verum is a mysterious girl who often appears as a spiritual being to guide Shion Uzuki throughout the events of the entire Xenosaga trilogy. She acts as an overseer of the flow of time that wants to protect the universe.

Trivia

 * Nephilim has a notable similarity to a young Elhaym Van Houten from Xenogears.
 * In the Japanese versions of both games, Nephilim and Elly share the same voice actor.
 * The pendant worn by Nephilim is similar to the Pendant of Nisan from Xenogears.
 * In Xenosaga 1, when Shion sees Nephilim, said pendant is even seen swinging back and forth similar to the cross animation sequence that appears every time Fei Fong Wong sees himself as a child in Xenogears.