Nameless Star

The Nameless Star is the spirit of a mysterious girl lingering in The Final World.

Kingdom Hearts III
The Nameless Star appears once Sora collects the first pieces of his body, alongside the other stars that are still tethered thanks to a bond. She tells Sora that "they" took away her name and everything about her, and that she is waiting for a particular person to come and find her. However, he has been transformed, his heart having been replaced by another's, and no longer remembers her, even though he would miss her if he could. Sora encourages her to believe he will return. Sora asks who did this to her and she tells him it was a somebody, not a Nobody, responsible. Sora offers to help reconnect the pair, saying that if he meets the guy, he will let her know she is in The Final World. The star whispers to Sora the name of who she is waiting for.

Trivia

 * According to Nomura, the Nameless Star is a character who has already appeared in the series.