ranks.yml

ranks:
  '0':
    prefix: '&8Player'
  '100':
    prefix: '&7Citizen'
  '1000':
    prefix: '&bProfessional'
  '100000':
    prefix: '&6Agent'

Here you can define some ranks shown in front of the playername in the chat (by default). In this example a player with 70 Karma will be a "&8Player" because he has between 0 and 99 Karma. The rank "&7Citizen" starts at Karma 100.