Infi

She is the program that pilots the Megarig. Her name is taken from the word "infinity" and her design incorporates lemniscates.

There are holograms of her spread throughout the airship, most likely so that she could scout the Reverse World, without the need to get out and report anything to Zero.

In the credits of the next movie, it was seen that she was recovered from the Megarig by Newton after it was destroyed.