Drones can be found in some missions who gain experience just like characters do, and can be repaired and upgraded with parts after appropriate research has been completed. Characters can have a single class such as Soldier, Technician, or Scientist.
In certain missions, drones accumulate experience akin to characters do, which can then be repaired and upgraded with appropriate components. Characters are limited to one of three classes: Soldier, Technician, or Scientist.