B1 and B2 are a duo of omnics designed to fit into the aesthetic of Null Sector, a faction within the lore of the game Overwatch. They are built to be opposites of each other in terms of build and purpose, while sharing some similarities such as the number of limbs, colour palette, and the established aesthetic of Null Sector.

B1 is designed to be lithe and tall, built for speed and stealth and to appear more human. B2, on the other hand, is small and stout, built to withstand and deal damage and to stray from the humanity that would make it sympathizable.