Five Pebbles (character)

Five Pebbles is the strange creature met at the heart of the Five Pebbles supercomputer. He is one of the two such creatures you can meet in the game, the other being an ailing Big Sister Moon. Five Pebbles is nonaggressive to the slugcat. He gives you the ability to understand him and, once he can talk to you, gives you directions to escape the facility and ultimately complete the game.

His dialogue is precise and clinical. He hints at feelings of dissatisfaction and the futility of his purpose (calling himself a "reluctant" gift to the world, for example).

Backstory (spoilers)
Five Pebbles is one of many semi-organic supercomputers known as iterators. The other iterator you can encounter is Moon.

Completing Moon's optional side quest after encountering Pebbles reveals that Five Pebbles is corrupt and is the cause of the the Looks to the Moon facility's collapse.

Pebbles' dialogue with you hints at the fact that he was left here by a civilisation that no longer exists. The lore Moon can read for you confirms this, as well as naming other iterators who may or may not still be active, and revealing the reason they were all built.

Trivia

 * Five Pebbles can move around his chamber while Big Sister Moon can't, because of the damage she has sustained.
 * He has a cloak... yes!
 * Five Pebbles reveals that his hardware is succumbing to damage -- and by extension the other remaining iterators are probably in similar states, apart from Moon, who is worse off.

Dialogue (spoilers)
A little animal, on the floor of my chamber. I think I know what you are looking for.

You're stuck in a cycle, a repeating pattern. You want a way out.

Know that this does not make you special - every living thing shares that same frustration. From the microbes in the processing strata to me, who am, if you excuse me, godlike in comparison.

The good news first. In a way, I am what you are searching for. [I] and my kind have as our purpose to solve that very oscillating claustrophobia in the chests of you and countless others. A strange charity - you the unknowing recipient, I the reluctant gift. The noble benefactors? Gone.

The bad news is that no definitive solution has been found. And every moment the equipment erodes to a new state of decay. I can't help you collectively, or individually. I can't even help myself.

For you, though, there is another way. The old path. Go to the west past the Farm Arrays, and then down into the earth where the land fissures, as deep as you can reach, where the ancients built their temples and danced their silly rituals. The mark I gave you will let you through.

Not that it solves anyone's problem but yours.

At the end of time none of this will matter, I suppose, but it would be nice if you took another way out. One free of... frolicking in my memory arrays. There is a perfectly good access shaft right here.