Each champion in the game is based off a champion in League of Legends, however due to licencing, LolManager cannot use Riot's intellectual property. Instead each champion has their own name which was voted on by the community in the beta stage.
Each champion has stats that determine how good they are at a particular position, these stats are for both position and playstyle. The circles are a representation of the stats, so the larger the circle the higher the stats are. These stats can be sorted in ascending and descending order.