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In both Uranus and Earth development as characters, we can see that they have a lot of paralells. Both seek validation and acceptance from the others, but they have opposite circunstances.
-The Earth has the attention of the others, has always recived validation. But that validation is considered conditional(at the very least, he believes so) on the fact thet he is the only planet with Life. So he perfects his charade and acts above others as a way to not lose this validation and power, as as he believes he will lose everything he has the moment he becomes unhabitable. That was—partly, there were other factors into play— what caused the moon revolution, as he felt threatened that, if Titan had life too, he would lose value to everyone.
Personally, I don't think it's just Theia that made him have such a need for being the planet with Life, that made him stay with it even after everything. Maybe it was a initial factor, but it wouldn't have gotten so bad that he believes he would stop being someone special—in the way someone can be to the others— as soon as he lost it.
Uranus, on the otherhand, feels a lack in validation. Ever since he was given his name, he felt like a joke to the others, and searched to be able to be as close to others as he could. His character has made a lot of mistakes—All have, honestly— but it seems all to build down on his lack of self-steem and crave for positive attention. But honestly, I don't think that even if he gets some positive attention he will believe it's genuine, just another joke or pity.
It was easy for him to be manipulated and baited by the new name, because he believed that things would be better for him after that, the he would get the validation he wants after it. But it just made him commit more and more bad decisions, that left him frustated and made him wish to leave the system with the one person he falt validated with. But I hope he eventually learns to love himself the way he is, same for Earth. Dunno if he will stay with the name Caelus, but for now it feels appropriate to call him that, especially since it is an important arc of character development that he is having.
That's my opinion on the characters, at least.
Thanks for reading!!