A sphere shape above a player's head, the marker changes color based on a player's actions. The default is green. When a player commits a crime, against the system or another player, the marker turns orange. When a player kills another player unprovoked, their marker turns red. A marker reverts to it's previous state three days after the most recent crime committed by the player. (Murder no other players for three days, your red marker turns orange. Commit no crimes for three days, your orange marker becomes green.)
Some areas and services can only be accessed by players with a certain color marker.
Player names and HP can only be viewed by the player themselves, others in their party, and players on each other's friend lists.
A player's level and equipment details can only be viewed by the player themselves.