There are several types of robots in Stray. Between them they comprise the entirety of the non-player Characters within Walled City 99.
- Companions: Androids, "designed to caretake for all life forms". These are the most common, and all have unique names and personalities.
- Helpers: Androids with names like Helper 477, designed as "autonomous cleaners".
- Peacemakers: Enforcement android with names like Peacemaker 22106.
- Sentinels: Unnamed and armed drones, used for enforcement.
- Laboratory droids: Roughly box-shaped robots that, if activated, will follow whoever activated them.
- Drones: Small robotic planes that move by hovering in the air, featuring with B-12.