I would definitely include at least a photo to sign with a Self Addressed Stamped Envelope. They a super busy and might not always have a chance to write a whole letter back.

Getting a response back is never a guarantee.

Hey everyone!

Obviously I'm new so I don't know really how this website works so I'm just looking for clarification. Are the addresses listed only for autographed things or can you send these celebrities letters and if so, is there a guarantee that they'll write you back?
I'm asking this because I've sent letters to three celebrities before:
[*]DAN GREEN: VOICE ACTOR (Yu-Gi-Oh!)
[*]GERARD BUTLER
[*]MISHA COLLINS: Supernatural

And I've never heard back. I am planning on sending a letter to Peter Cullen (Optimus Prime) and I REALLY want that one to work because he's changed my life so drastically, in a good way, and I want him to know that. Will the address that's here on this website work for a letter like that or not?

Thanks in advance for your answers!!