Q9-0, called Zero, is the droid pilot of a mercenary crew hired for a prison break in The Mandalorian's "Chapter 6: The Prisoner", which aired on 13 December 2019. He is voiced by Richard Ayoade.
The performance is the reason anyone remembers him: Ayoade plays a homicidal droid entirely in his own flat, faintly bored register, which makes the moment Zero decides to shoot the baby feel less like a plot turn than an administrative decision. He is destroyed in the same episode; his wreckage is reused as a vocabulator in season two.
Catalogue entry. This figure has a verified record here rather than a full write-up — the encyclopedia labels its own depth instead of padding it.