Venus

Hey! watch it pipsqueak!

Venus is a short-tempered rocky planet who might also get aggressive when provoked too much. He hates the fact that he was named after the Roman Goddess of Beauty and Love, Venus, which the planets would occasionally tease him for.
He is usually seen being dominant towards Mercury which he would make the latter stay in his orbit, not really allowing him to interact with the other planets sometimes, even bullying him verbally by calling him 'pipsqueak' because of his small size.