Taken collectively, this solar system’s celestial bodies must number in the thousands. It’s so much bigger than we were once taught - and so much more interesting.
I would think this planetoid like object would be massive enough to form a sphere.
Unless there is some strong tidal forces at work from an unknown object I would guess this object had a huge impact event sometime in the past.
The chart needs to be updated—a few days ago they reported that Pluto has four known moons. The new one is very small, like Hydra and Nix, not like Charon.