Pick a friend, a celebrity, someone you admire, someone you know about, or someone in the room. Freestyle about them, about the great things they have done and what you like about them.
This is basically the opposite of a conventional MC battle. Instead of bringing someone down, you are talking them up. It’s great positive experience to focus on someone’s good qualities, and because of that it’s a great hit at birthdays, weddings, and other events in honour of someone.