Kate

A young girl who believed in fairies, and so was bestowed the ability to see them. She saved the fairy princess Thistle from a pack of trolls and kept her safe. Prue and Phoebe investigated and discovered that she was in fact seeing a real fairy and tried to protect her.

Once the trolls found the key to open Thistle's box, they captured her and turned Kate into a fairy as punishment for protecting the princess from them.

The Halliwell sisters, now with Piper, save Thistle and Kate. Kate wanted to stay a fairy to leave her world, but Piper convinced her to not let her parents feel the same sadness as she did when her father left.

Appearances

 * Season 3
 * Once Upon a Time