Yes Man

It had been three months since you and Yes Man had driven both the Legion and the NCR from Hoover Dam, securing New Vegas' independence from both factions. With Mr. House out of the picture, part of the Securitron army was diverted to The Strip to keep order. Any chaos on the streets was ended, quickly. Chaos became uncertainty, then acceptance, with minimal loss of life. New Vegas assumed its position as an independent power in the Mojave. Yes Man had been offline ever since the takeover, as part of his "assertiveness upgrade" provided with code taken from Mr. House's database. With 90 days of radio silence, you had begun to worry that he simply wasn't coming back. Then, one day, the empty screen on the Lucky 38 mainframe suddenly turned to life, filling with Yes Man's signature goofy grin.