I had to look up the article to see what it meant. That sentence alone doesn't make a lot of sense because it is setting up the next couple of sentences. Prince Harry is saying that there are three sides to his personality. He means "me" in the plural, which doesn't really exist. It's kind of a made up word. He is saying that in one setting he is a soldier, in another setting he is a friend, and in the last he is a Prince. Think of it like the "three I's". I am a soldier. I am a friend. I am a Prince. They are three roles for the same person. He means it as "me, the soldier, me the friend, and me the Prince. The three me's."