The Emperor is a drivable tank manufactured by Maliwan. It was planned content for Borderlands 3, but was removed from the game during development. Apart from a small appearance on Gabe's Used Autos, a Borderlands 3 teaser website, some information about the Emperor has survived in the game's files.
The Emperor was a Maliwan-made tank. Catch-A-Ride icons indicate that like other vehicles in Borderlands 3, it would have had several collectible modifications, including 3 front gun options, 2 cannon options, and 4 wheel/tread options.