While writing fanmail--
DO--
Make a 'bookmark'. What I did was I said really random stuff and drew colorful pictures and wrote random, colorful sentences around the letter. It could be something like a cool-colored envelope or a picture of your cat-- anything that when, or if, you meet this person you can say, "Yeah, I'm the person that --whatever you did special--" and they would say, "Oh, yeah! Then I know who you are!". It's something that keeps a tab in their mind and sets yours apart from others.
If you are sending a picture of them for them to sign, make sure there's something behind the picture (not attatched) that keeps it straight and not flat. Also make sure you have enough postal stamps if you're mailing a larger envelope.
Mention them writing back. "It would be really cool if you could sign this and send it back!" works better than "Sign this and give it back, please!" because the first one implies that they have more power, while the second implies that you have the power. They like power and the thought of doing something nice for a fan.
Include your name somewhere in there. If they are going to personalize a signature for you, they need your name.
Send a picture of them for them to sign. That's your best shot of getting something back.
DON'T--
Say "It's so cool that you're on TV!" This just makes the point that you're not famous and you really have nothing to do with them besides the fact that you're just an admiring fan. Instead, say, "You're so talented!" to compliment them on their screen-time accomplishments.
Just say, "I watch you every day and think you're amazing! Everyone I know loves you! I hope I can meet you some day!" etc. That's too... normal. Do you want your letter to be 'just one of the others'? No! Don't make it like the others! Make it stick out!
Use the stickers with your parent's name on it for the return address. Instead, write your name and then your address. They most likely refer to that part to personalize a signature or a letter, and you definately don't want your favorite star to accidentally write a letter to your parents!
Write a letter saying, "I mailed you three months ago, but you didn't respond. Please repond!" It usually takes many, many months for them to respond (if they even do). Your best shot at hearing back from them is if you mail a picture of them. Then they pretty much have to sign it and give it back.
So go and find your favorite star's fanmail address. Use these tips and write an amazing fanmail letter that will definately make it's way to the top of the 'favorites' pile!