Archfiend's pretty similar in that regard. It's obvious things like Shadow Tamer or Fiend Skull Dragon were never really intended to follow the theme.
That being said, the more broad archetypes tend to keep releasing unrelated cards for the archetype. Guardian is a massive example of this, where it actually has more unrelated members than related ones, like the Guardian of Felgrand in the recent OCG Structure Deck. As is Archfiend, with things like Number C102: Archfiend Seraph. Noble Arms is shaping up to be another, going by the new Celtic Guardian. And, of course, so is Prophecy, with things like Ebon Illusion Magician and Breaker the Dark Magical Warrior.
Also, oh god, I didn't think I'd come across any more weird things, but... Skilled Dark Magician is the only Skilled Magician that's a "Magician" monster. o.o Even Skilled WHITE Magician isn't.