Imagine this as about any character you wish, I kinda see Remus. But I'm kinda biased, I also see Remus as Ewan McGregor. It's a beautiful image indeed. Granted I could also imagine Peter Pan really well here, but I'll focus on the Harry Potter aspect due to where it is.
So yeah, this is with Remus in mind!
Sonnet
Majestic and tall
Dark and deep
If put against a wall
A secret he'll keep
He'll listen to your dreams
He'll make them all come true
Perfection he seems
He is there just for you
But deep inside you know
You'll never have him to hold
No true romance to be had
With him you can't grow old
He's a creation of your mind
Him in real life you'll never find