Charonball is the frozen mass relay of Sunball  moonball of Plutoball. Charonball is the 12th biggest moon in the solar system, also the biggest moon of Plutoball (and thus first to be dicovered).

Interestingly, Charos's orbit around Pluto is completely circular (i.e, it's eccentricity is 0).

He's a bit of bigs. Pluto is more bigger than him.