Player's display name, that can contain Minecraft's formatting codes. It shouldn't contain suffixes nor prefixes.
Player's id, used to associate the skin with the game's entity spawned with AddPlayer.
Player's skin usually given in the Login's packet body.
UUID of the player. If it's associated with an XBOX Live account the player's profile will also be available in pause menu.
Informations about a player that will be added to the player's list in the pause menu.