First the big one: Number of posts pr user
Number of games pr user
The number of characters a user has made. I'm seeing a pattern here Qralloq
How many posts have a user made divided by the days the user has been active. That gives us an average posts pr day
Distribution of the players that have marked their location.
The location data is very unstructured, so there is a bit more hit and miss here.
Gender distribution. There is a lot of players who have not defined their gender :/
The number of game pr game systems