Can I recommend titles like in other games? For example, kill Atheon and you can earn the title "Timebreaker" or something. Kill Crota and become the "Godslayer". Earn so many kills in the Iron Banner (or something with Rise of Iron) and earn the title "Iron Lord". Something simple but it adds some of the personalization that people crave. I'm not a programmer though so aim not sure how easy it'd be to add that to the game.