Let's write!

Today, let's write a letter! Write a letter from one character to another. It can be about anything you want, but you have to balance realism, character, and entertainment. In reality, there are differences between how a person writes a letter and from how they speak, and these are influenced by who they're writing to and about what. Even email is written differently from snail mail.

Can you write a letter that still sounds like your character and how they interact with the receiver, but sounds like it was written rather than spoken, and yet also is entertaining and contributes to whatever story the letter is in?