Alignment!

The alignments of Warlocks are always chaotic or evil, so to make a warlock character it must be decided that he is to have an alignment with either Evil or Chaotic in it. Or he can be made into a Chaotic Evil warlock, a real badass bastard who cares not for law or order. The choices are different and brings different personalities, so it is best to think before deciding, or just plunge headfirst into it.