While droids have always been a key component of the Star Wars Universe, they have largely been relegated to supporting roles and background players rather than stars of their own stories. At least, that is their usual role, though some droids have managed to make their way to the forefront of the franchise even without tying themselves to any more iconic characters.
Source：https://www.cbr.com/star-wars-dark-droids-comic-tragic-heroes-reveal/
