Our system is full of surprises...
One of the smallest and most remote outposts in the solar system is also one of the most varied and unexpected. And remember, Pluto isn't simply at the farthest frontier, it is only the first world, the gateway to the Kuiper Belt, which extends much further out, deep into the cold and dark.
As always, the Universe always seems to be much more complicated and interesting than it really needs to be.