Robot (Legend series)

Robots are one of the main character types in Final Fantasy Legend.

The Final Fantasy Legend
Robots are not a playable characters.

Final Fantasy Legend II
Robots are innately immune to paralysis and poison and improve based on the equipment they have.

Armor will raise their HP and boost their defense The gain is not necessarily the normal value a human or mutant would gain from wearing it. They can also wear multiples of the same slot (helmet etc.)

Weapons will increase their strength and/or agility. Robots cannot boost mana. This means they take the most damage from and are healed the least by magic. There are a handful of enemy attacks that specifically target Robots. Weapons used by Robots are restorable at Inns. There is a catch though: weapons equipped to or from a robot have their usage cut in half (a sword with 50 uses is reduced to 25 on a robot, and 12 if it is removed from the robot.)

Final Fantasy Legend III
Robots and Cyborgs upgrade by buying parts.