The Dark Side Series by Kristy Cunning

A phantom with no name and recollection of the past happens to be mysteriously attached to four entities. Who’s she, and what’s her connection to the four of them? Anyway, she named them One, Two, Three, and Four, and she has a fantasy plan with them when she becomes corporal! That’s if they trust her.

Soul Guardians Series by Kim Richardson

Kara was only sixteen when she died. But what she didn’t know was that there’s life after death, and her new role as a guardian angel was about to take a different turn with her unique heritage. Other readers might find the story predictable and annoyed with the repetitive storyline, but for a clean reader, this might be just the series for them.