Connor and Holtz were never supposed to be the only humans in Quor'toth. In fact, *someone* had to name him the Destroyer. The slang didn't come after one ep, although it did come pretty fast. Connor has peculiar speech patterns throughout his run though- sort of like how Angel gets an Irish lilt when he's pissy and/or soulless, Connor reverts to formal speech when he's pissy and/or Destroyer-y.

Word to DB's hair. I heard him talk about it at a con once, I think? Or maybe someone else talked about it. Apparently, he wanted to do his own hair, and they wouldn't let him, and it became a running gag.