Basically, store avatar information for local stores. It doesn't have to be the actual file, just a way for osu! to access it and show it on local rankings if you are online (when offline, a placeholder may be used for all scores). Also, if no player information is present, it might look better if the default name was "Guest" and/or a placeholder avatar was used, maybe like the one on new.ppy.sh.
Thanks for reading.
Thanks for reading.