Recommendations Two recommendation requests

[ThrillingHuman]

Serial killer main character who kills because he (she etc) loves. Loves so much that he can't bear to let the victim out in the cruel world, wants to end them at their best moment.

Mc reincarnated as a literal star.

 

[melchi]

These are both hard. I can only think of yandere simulator for the first one and it isn't and exact match.

For the second one there is that mana core story but it is more trying to create life in a lifeless moon.

I think serenity has a side character that is a sun diety and watches over a planet but not a great match because it is a side character.