Fun story:. Couple years back I mentioned that I remember most people by their avatars rather than their names, and that a new avatar is basically a fresh start with me.
In reply, one of my acquaintances posted a collage of all the avatars he'd used over the last few years. Not only did I recognize multiple "different people," but I had significantly different feelings about those people. I thought of some avatars as belonging to nice dudes, others as belonging to jerks, etc.