Borderlands: The Pre-Sequel can now played in third-person with a new unofficial mod.
You can now play the PC version of Borderlands: The Pre-Sequel in third-person perspective, if you want. Modder TFXLive has a video below showing you how.
According to TFXLive, this mod relies on a behind-the-character camera that exists in Unreal Engine, the engine Borderlands is based on. This perspective is typically used for debugging purposes. The Borderlands games have fully-modelled characters that can be viewed in third-person, which is why this mod works.