Oberon

Oberon is one of the Five Major Moons of Uranus. She's the second biggest moon, and also the second most massive, and she's considered to be Titania 's twin. She's one of the meanest moons in the Solar System, but, unlike Io, she is like this only because of herself.

Personality
As said before, Oberon is one of the meanest moons in the system, and always complains about basically everything, as shown in Episode 1. She can easilly offend other moons, and even planets. She has to be drifted away from fights by Titania, so she can stop annoying people.

Appearance
Oberon is a spheric moon, with a mostly gray surface, and some darker areas.