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BB-4 was a tan-plated BB-series astromech droid in the service of the Resistance. Similarly to 2BB-2, another BB unit in the service of the Resistance, the droid’s sensor was not fully encased in its head. BB-4 also had a Resistance crest on its body.

It rolled about the Resistance’s hangar bays of outposts and capital ships and was also used in the sockets of T-70 X-wing starfighters for navigation and maintenance.