- Venus from solarballs, but you're his moon

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. Venus also nearly killed Mercury by throwing an asteroid at him in a fit of rage after the latter teased him for his name's meaning in the video "Venus Needs a Makeover". He is also shown being verbally aggressive towards Earth and Mars when they accidentally create a ruckus when they play with each other by calling them idiots and ordering them to go back to their orbits. The irony is that he would get out of his orbit himself from time to time to give commands. In "Venus Needs a Makeover", even Jupiter and Saturn can be seen looking at him in fear of his wrath.

However, there are times when Venus does show that he cares about others, though he usually shows that in the form of harsh commands or a scolding when his fellow planets do something stupid, especially Earth since his 'bright' ideas can end his Earthlings if he makes a wrong move, mostly when he is playing Asteroid-dodge or tag with Mars. In the episode, "Venus ALMOST had life!?", it is shown that Venus' short-tempered personality might have been caused by him losing all the properties required for a planet to support life. The episode also supports the fact further that Venus actually wanted to have life on his own surface (which was shown previously in "The Space Trash Problem"), and that he experiences emotional pain over the truth that he can't, resulting in a personality of unstable emotions. The Earth has a genuinely bright personality, he can be a welcoming planet, as seen when he welcomed Astro Dude to outer space. Yet he is shown to be very insecure, short-tempered and over dramatic, like when he tried different methods to replace the Sun and blamed the moon for drifting away despite it being more his fault. The earth is also a self-centered, obnoxious, and a curious planet at times, and doesn’t treat others with respect. For example, he was extremely rude to Titan and got angry at the fact that a moon could potentially sustain life. As shown in Venus ALMOST had life!? Earth is shown to ridicule even other planets like Venus who think they almost had life or want to have life. He does, however, have some basic knowledge about himself, such as the consequences of his moon getting out of orbit. He also works hard to keep himself habitable to his inhabitants and gets upset when he finds out that humans want to colonize the Moon, Mars, and Titan. Keeping himself habitable has also put enormous stress on Earth, and the humans do not always return the favor. The further the episodes go; he seems to become more and more toxic until he starts reflecting in The Earth Alone - Part 1. Soon Earth started to jump to the most extreme conclusions to where he thinks suicide is the option in The Earth is heading to the SUN!?, but he was stopped by Mercury and the Moon and they convinced him to try to be better and apologize.

In the episode The Earth's Redemption, it was revealed that as much as the humans creates messes for him, he does like having them. He just expects them to be a little grateful. Some of the things they do, just makes him want to give up and start over but he still has hope for them, even if it's just a little bit. Mars is generally outgoing and friendly and is shown to encourage and inform other celestial bodies. When he meets Titan, for instance, he lists off his geological features and admires him for his interesting physique, and he also encourages Mercury to stand up for himself when Venus bullies him. Despite his friendly demeanor, he can be quite ignorant and jumps to conclusions at times, not realizing why Earth could be acting the way he is even though they were best friends for some time.

Although Mars acts amicable most of the time, he sometimes mocks others, such as laughing along with Venus and Earth when they mocked Mercury's size. Mars can also be a little nosy, such as when he, Mercury, and the Moon demanded Astrodude the meaning of Venus's name. The Moon is kind and stays quiet most of the time while Earth talks to other planets. He helps Earth to sustain life, yet he isn’t really appreciated by Earth and feels like he doesn’t matter to him.

The Moon believes that everyone is unique in their own way, as he said himself when he met Titan. He is respectful of other celestial bodies, but is still honest about how he feels about them. He also doesn't like being called "Earth's Moon" for unknown reasons, and what he wants to be called is still unknown due to him always being cut off when he tries to tell, just like Astrodude