An online username is not only a unique way to identify someone on a service, it can also define who that person is. Check out the stories of how DRULcrew came up with their usernames for gaming.
Released 5 months after the launch of Xbox One, Titanfall was supposed to be Xbox One's 'killer app'. Criticized for being shallow because it lacks a single player campaign, and other people ragged on it because they disliked the addition of titans...