Hannah Rodriguez is a mechanical engineer who creates robots for Buck. She was brought up in the outskirts of Seel and after her whole town was wiped out by bandits, she was found by Buck.

Due to her intellect and interest in robots, she was hired on with Buck to create robots as a defense against bandits and law-breakers. However, due to Buck not wanting her to know what she actually is doing, she is kept underground to create robots without distraction or potential to be harmed. On top of this, Buck is her only news source, and so she has learned to trust him time and time again, especially when proven that he is delivering on his promise.

She views Buck very highly, thinking he is very passionate about saving humanity and shares the same views as her. This has caused her to overlook the strange and lethal orders for the robots, as well as trying to befriend the other employees despite their anti-social behavior.