E3N "Ethan"

Petty Officer First Class Enhanced Tactical Humanoid 3rd Revision (E3N) (A.K.A. Ethan) is one of the supporting characters in Call of Duty: Infinite Warfare.

E3N is designed to be a "one-of-a-kind" tactical soldier bot, capable of human responses and emotions, making it significantly more advanced than the C6 robots, which are little more than mindless drones. Initially it is not accepted by some of the crew members, especially Omar. However, Omar eventually grows to like E3N.

(Author's note: Most info is taken from the Call of Duty wiki)