Pixie.

There's a Pixie at the bottom of my garden. She never makes a sound, but I know she's there because every morning she eats a bowl of sweets for breakfast, and I find the shiny wrappers dancing across my lawn in the breeze.

I had never seen the Pixie until the day I caught her swinging at the local park. She's not easy to spot, because if she hears you coming, she'll run away, but that day, she was too distracted by the air kissing her face and the squeals of the swing set, so I got a good look at her.
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She's the prettiest Pixie I've ever seen, although I've only seen one. I want to tell my friends about her, but who would believe me?