Batman (Dark Knight Corps)

After witnessing the brutal murder of both his parents as a young child, Bruce Wayne trains himself both in mind and body to the pinnacle of human achievement, and dons the mantle of the Bat to strike fear into the hearts of criminals everywhere as Batman.

General History
Batman of the Dark Knight Corps comes from Universe that closely resembles Earth-0 of the DC Universe. However, a major change occurs when a Sinestro Corps Ring selects Bruce Wayne for membership in the Sinestro Corps. In this Universe, Batman never dons the Hal Jordan's Green Lantern Ring after Jordan's Rebirth. Consequently, Batman's Willpower is unable to override the Fear of the Yellow Ring.

It is unknown how Batman wrested control of the Sinestro Corps from Sinestro but Batman claimed to have killed Sinestro to Superman during the event which brought Batman into Traitor Game XII.