Could've Been King

The Could've Been King led the Army of Meanwhiles and Neverweres during the Last Great Time War. The Tenth Doctor described this as one of the potential horrors that would be released when broke the time-lock on the war, along with the Nightmare Child and the Horde of Travesties. (TV: The End of Time)

Some believe the "Could've Been King" could be more metaphorical, indicating the many rulers who tried to seize power in the chaos left behind by the Time War.