Prompt book

Rise of the Guardians

(Tw: death and fire mention)

So we know the Guardians (and whatever they're called if they're not official Guardians-let's call them Spirits cuz idk what they're called) all had previous lives and we assume that they die before becoming the Spirits and I think that to become a Spirit they have to help children in their life and when they die.
Sooo-
What if there was a Spirit that was a child themself?
Like a child who helped all the kids around them and died trying to save them like from a fire or something and became a Spirit after death.
One day the Guardians just find this little kid that's found one of their hideouts and get really confused and worried that they've got another Sophie situation. Then they realise this is a new Spirit but there's never been one so young before. Since Jack has the most experience with kids he takes care of them and shows them the ropes