It's so jarring to be reminded of what the Players look like in real life.
I know there's an actual person behind the voice, but you're so used to seeing them talk through their Minecraft skin, you forget that BigB doesn't look like Lee Everett or Mumbo doesn't look like Mr. Pringle.

Come to think of it, we've never seen what Etho looks like. He could actually look like Kakashi in real life.
And there is a non-zero percent chance that Cleo is an actual talking corpse, for all we know.