I've played World of Warcraft since October of 2006 and during that time have seen many realms, their communities, and the special people that have made a lasting impression on my WoW memories. Many of my friends and family have also switched their character's names, transferred to other realms, or even faction-changed (or some wicked combination of the three!) -- but when that happens, you lose that factor of recognition, and you sometimes even lose a friendship along the way.
When I was in my PvP is my all and everything mode, I hopped across realms, switched names, and swapped races to try and find the right teams, the right realms, and the right players so I could maximize my Arena ratings and potential. But in doing so, I burned many bridges across the way, until I met a particular Undead rogue who made a lasting impression on me. He guided me through class-by-class duels when I was a novice. He never hesitated to give me constructive criticism and helpful advice when I lost 0-100 against a death knight. And he certainly never told me to "get good" or any of the other >9,000 ways someone can insult you.
And when I left my home realm, I felt I owed it to him to write him a letter before I left. I didn't know this guy in real life, but something just told me I had to. I told him I was grateful for his kind words, his encouragement, and his patience and that I wished him the best in his WoW career, as he had in mine.
And there it is! This is what I said to the person who made the most lasting impression. What would you say to that someone?