Star

Star is one of the four Greater Beings that represent each individual area, the area he watches over is Deutera. They are all masked in some way and are often described in ways that suggest everything is the way it is because of them and they're the ones that dilute and makes one become blank. With all the dialog suggesting the events regarding Limbo were all supposed to happen, it seems like these beings maybe have gotten bored of their realms.

His mural is on a building in Deutera that shows a star over his head, and on the rooftop of the same building, a painting of the eye is present, possibly watching the player.

The building with the mural has a nearly empty interior with a poster of him and text saying "He will protect us by diluting us " and another "He will dilute us by protecting us".

Book
The book mentioning him first describes him as peculiar, mentioning he could be here or there. It then says he can't feel anything because he doesn't know how to and wonders about and questions many things. Despite how he seems, he still does look down on others and even wonders what it'd be like to kill them. He has the power to destroy the worlds if he wanted to but decides not to since he's aware that it would make [you] sad. It's also mentioned that he wants to give up and turn to dust, but decides not to since, once again, he knows it would make [you] sad.

Appearance
Star has an ashen skin tone without an actual face with what appears to be horns forming at the top, and in between those is a soft light blue forehead cloth depicting an eye with brown sclera and a black iris. He's the only one of the Greater Beings that has no eyes at all as well as no hair as far as anyone can tell. His outfit appears to be skin tight with shades of dull dark and light blues, the collar resembling that of a low cut v-neck that goes down to the chest. He's physically depicted with an average frame while having a flat chest and partially wide hips, which could be from them being genderless.