My setup

MessageFormat: '+pre&7+pname&f: +msg'
Groups:
  admin:
    prefix: '&4[Admin] '
    suffix: ''
Users:
  SaiFive:
   prefix: '[&6Server-Owner&f]'
  playerperson:
    prefix: AwesomeDude
    suffix: ''
  anotherplayer:
    prefix: AwesomeDude
    suffix: ''
Defaults:
  prefix: '&f[Visitor] '
  suffix: ''
  group: Default