Colored Players

Over each player's head is a little rhombus that spins constantly. The color of it depends on the player and what they've done. If the color is green, that player should be more trusted then players with different colored rhombuses that over their head. This means that the player is right with the law and has not committed any crimes. As of orange players, those are villainous players that engaged in crimes or have engaged in one recently. The most common crime is accidentally hitting an other player when trying to hog one monster. Red players are the most dangerous to new players, or 'noobs', and everyone in general because they are murderous players. They have killed at least one player recently or 'PKed' them which stands for 'player-killed', or 'Player killers'. Once in-game guilds have been developed, there could be different guilds filled with entirely orange and red players, so watch out. Also, if you are red/orange, you will eventually turn back to a green player in an amount of time, so who do you know who you can really trust?
Here are some pictures of players with different colors: