Neuron Fly

Neuron Flies look like two thin tails connected to an oblong floating body with a white eye (or face) and shift colors randomly through red, white, blue, or purple, except for the unique green neuron starts with. They are prevalent in Five Pebbles​ and a small number can be found in Looks to the Moon floating over the puppet of the Iterator.

Utility
Neuron Flies provide 1 food pip (1/4 of a pip as ) when consumed, and grant  the ability to generate their own light for the rest of the campaign when consumed for the first time on a save file. They can also be stored in Slugcat's stomach.

While the Neuron Flies in Looks to the Moon do not respawn, the ones in Five Pebbles​ do as soon as the room is unloaded by going far enough away.

After eating a Neuron Fly, Void Spawn will appear near Slugcat in certain locations. They are trapped in little 'eggs', and upon touch, they break free and slowly travel in a direction that leads from Looks to the Moon to Memory Crypts, guiding the Slugcat in the direction of Five Pebbles instead of the.

Looks to the Moon's Neuron Flies
When is found, five Neuron Flies are flying above her. Catching these neurons causes Looks to the Moon to shake her head frantically and try to talk to Slugcat. With the Mark of Communication, she will urge Slugcat to let them go. Eating them makes her throw herself to the ground and jerk around. Eating at least one earns the Stolen Enlightenment achievement. Eating all of them kills Moon. If Slugcat hibernates without eating one of her Neuron Flies the cycle they find her, the A New Friend achievement is earned.

From then on, as long as the player hasn't eaten any Neuron Flies, the yellow guides Slugcat to more Neuron Flies for Looks to the Moon. Following the Overseer takes Slugcat to Five Pebbles, in hopes that Slugcat delivers some to. If Slugcat has already eaten a Neuron Fly from Looks to the Moon, they can still find their way to Five Pebbles by following the aforementioned Void Spawn.

Moon has the ability to read s found in the world with any number of Neuron Flies above 0.



The Hunter's Neuron Fly
starts the game carrying a unique green Neuron Fly. This Neuron Fly can be stored in Slugcat's stomach to leave both hands free. If it lies on the ground for a few seconds, it starts hovering at the level of Slugcat's head above the ground and occasionally emits a complex hologram from its form.

When the green Neuron Fly is brought to Looks to the Moon, who is initially exhaustively incapacitated when Slugcat meets her, the green Neuron Fly reactivates her own Neuron Flies and brings her back to life. This is because the Neuron Fly holds 'slag keys'. died because accidentally deprived her of water, causing slag buildup which caused her processes to seize. The slag keys likely reactivated her water systems to flush out the slag and allowed her to become active again.

Trivia

 * Neuron Flies cease movement and lose the ability to fly while outside of Five Pebbles or Looks to the Moon. This fact makes carrying neurons between the two Iterators much easier.
 * The only practical reason to deliver neurons to Looks to the Moon as or  is to receive bits of lore when she formats them, or to replace the neurons Slugcat ate.
 * Looks to the Moon still accepts partially eaten neurons.
 * Neuron Flies do not have a Sandbox item, similar to s.