It is quite easy to predict how LOLKing and LOLNexus look up to League of Legends player statistics. The profile of each League of Legends players is usually publicly available as an HTML document, a website document, which is read by the LOLClient.
This is just another way of saying that any web browser is capable of displaying the profile of League of legends players. Furthermore, the LOLKing and LOLNexus use a special bot, a modified web browser that is capable of filtering and sorting the information, to get those specified details. Fundamentally, the LOLNexus uses the Riot games API to find out the number of players that are connected to the game, thereby obtaining their profiles. It is also possible that they use a feature of ‘spectator’ to determine the number of players that are connected to the game. Conclusively, it is possible to learn the skill behind the use of the resources needed to identify and analyze the League of legends players’ statistics.