Okay,let's talk about the deal of Beatstar and Jean-killer:
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About the artificial celestial body thing:
Basically, it was a giant space ship built by people from an unknown universe. It was supposed to be the "lifeboat" that helps its passengers to escape from Alien Bat's attack, who eventually destroyed the planet completely. This giant space ship also has ability to travel across different universes.
About BeatStar:
BeatStar is the guardian and the brain of the space ship. He is programmed to destroy anything that could threaten the stability of its "body." BeatStar witnessed how its siblings continue fighting each other in the space ship (for leftover resources). He came to the conclusion that organic lives are just selfish and violent beings, and eventually they will destroy this place just like how Alien Bat destroyed his creator's planet. To protect itself, it killed its passengers. Beatstar was also afraid of people from outside will invade this space ship. So it started building its own mecha army to kill off all lives wherever it travels.
BeatStar is basically the same as VIKI in
I, robot.
About Jean-killer:
Jean-killer, like many other robots in the celestial body, he is a copy of its original form (Jean-bot). Jean-killer's core system is basically the same as Jean-bot's, a system that is programmed to obey Princess Emerana, to protect lives, and also value lives. BeatStar only controls Jean-killer by shutting off its core system. That's why once Jean-killer is able to open its "heart" by itself, he (call it "he" now because "he" has a heart now) join Jean-bot's force immediately (because they have the same value). In the end, princess renamed him Jean-Nine because he's the ninth warrior (after UFZ, Rei, Boss, the two monsters) who protected her.
BeatStar's last words:
Why...? Was I wrong? I can't be wrong. I am logical and rational. My existence only protects and maintains the justice of all universes. Only I could...only I..(flashback)..I was scared...
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