Why are the names of some Xuanyuan legends blue-green?

In this game, different occupations make the names different in color, so as to facilitate others to know the words issued by various occupations.

Purple is the word typed by an assassin. If you are a soldier, a magic bow, a mage or a pharmacist, you can't turn purple.

Assassin color purple, warrior color red, magic bow color green, mage color blue, pharmacist color yellow.