Definition: Player Characters are all the people that you play the game with. They are the characters that are controlled by other people around the world. Players can currently pick one of five races: Mithra, Tarutaru, Elvaan, Galka, or Hume. All player characters play the role of adventurer.
Each races has their own special qualities to them. Considering your race in advance can prove to be a benefit to your future adventuring.
[More in-depth race guides are found here.]