Yes Man

Yes Man is an AI program that serves as Benny's assistant and right-hand man in 2281, and is an integral part of Benny's scheme to take control of New Vegas. Yes Man appears to be a modified securitron. More specifically, his personality program has been put into a PDQ-88b securitron; although he may later assist the Courier in one the "independent" New Vegas endings as the Lucky 38's mainframe.

Background
Yes Man was originally a generic securitron robot programmed to work for Mr. House like all the other securitrons found on the Strip. He was recovered by Benny and several of the Chairmen after being damaged by a pulse grenade. Following this incident, Followers of the Apocalypse member Emily Ortal examined the securitron in order to learn Mr. House's secrets in exchange for reprogramming him for Benny's personal use.

The reprogramming was extensive, and resulted in Yes Man being designed to do exactly as he is told; thus, Yes Man is not just the program's name, it's also its job description. Yes Man is completely incapable of declining any order or withholding any information he is asked for, no matter who he is interacting with. Benny's plan was to dispose of Mr. House and install Yes Man's A.I. onto the Lucky 38 mainframe, putting Yes Man (and by extension, Benny) in control of all the securitrons on the Strip. The next step was to take the platinum chip to the Fort, take control of the great weapon he suspected Mr. House of having hidden away (as he did not know exactly what was stored there), and use this "weapon" to assume control of New Vegas and Hoover Dam.

Location
Yes Man is initially located in Benny's suite in The Tops casino. To gain access to Yes Man, the Courier must either kill Benny in the casino, sleep with him (requires the Black Widow perk), present Swank with evidence of Benny's treachery, or confront him and force him to flee to the Fort.

To find Yes Man, enter The Tops casino and proceed straight ahead past the casino floor to the elevator bank (near the sign that says "Elevators out of Order"). Take the second elevator on the right to the 13th floor. Exit the elevator, turn right, and enter the third set of doors on the left side of the corridor (double doors with potted trees flanking them). Go into the room and through the hole in the wall in the back of the room.

After the player character finishes Ring-a-Ding-Ding!, Yes Man will have moved to the front of The Tops casino in order to begin communication and further mission progress with the Courier.

Ideology
Yes Man is a hacked securitron that was, without Mr. Houses' knowledge, extensivley re-programmed by the ambitious leader of the Chairmen Benny, with the help of Emily Ortal, a member of the Followers of the Apocalypse. Programmed to serve anyone who requests it, and follow orders without question, Yes Man was intended to supplant Mr. House and take full control of the Lucky 38, and, by extension, the Strip. As a central part of Benny's master plan to usurp control of New Vegas and expel both the New California Republic and Caesar's Legion, Yes Man's main objective was to use his connection to Mr. Houses' internal databases and secretly feed information to Benny that would help him keep up to date with Mr. Houses' plans.

After navigating these databases, Yes Man discovered various mathematical calculations regarding the Strip's defensive capabilities and plans to arrange a Courier to deliver a platinum chip. After feeding this information to Benny, Yes Man helped to notify him of all the routes, arrival and leaving times and potential ambush areas where the chip could be retrieved and the Courier disposed of without Mr. House learning of Benny's actions. This information led to Benny recruited members of the Great Khans and journeying south to the Goodsprings Cemetery where they successfully capture and neutralize the Courier, stealing the Chip and burying the Courier, leaving their abductee to die. Benny soon betrays his entourage, leaving them to fend for themselves against the NCR in Boulder City and returns to the Strip where he idles around in The Tops surrounded by his personal detail.

Once the Courier arrives on the Strip, Yes Man will divulge all of Benny's plans to usurp power and offer his services to this new arrival. If the platinum chip is recovered, Yes Man will reveal the full extent of his plans to dispose of Mr. House and replace him, availing to serve the Courier in any way should they succeed. Continuing without Benny, Yes Man will gladly serve the Courier and will follow any command given, essentially giving the Courier full control over the Strip and allowing any actions to be taken on the other factions vying for the Mojave Wasteland. Although Yes Man will give his opinions an advice on how to deal with other groups, the only factions that must eventually be confronted are either the NCR or the Legion depending on the choices made.

Once the Courier's power and relations are solidified, Yes Man's next step is to activate an army of upgraded Securitron MK II's, using the platinum chip to distribute this software to all active Securitrons to increase their offensive and defensive capabilities. Before the final confrontation at Hoover Dam, Yes Man will require an override chip to be installed in the NCR occupied El Dorado substation, intending to divert power to the Lucky 38's dormant reactor thus being a vital strategic point for power should Hoover Dam be damaged or destroyed during the battle. Yes Man will also request the Courier to enlist the help of the Followers of the Apocalypse although this is optional. Once the preparation is complete, the final confrontation can result in the Courier diverting power from the Dam to the dormant Securitron army beneath The Fort, defeating the Legion and betraying the NCR, expelling both factions and leading a "truly independant" New Vegas as originally envisoned by Benny, with the decisions made by the Courier forever shaping the Mojave.

Quests

 * Wild Card: Ace in the Hole: The Courier meets Yes Man for the first time. As there is no restriction on who Yes Man can help, the Courier can interrogate him to find all the details of Benny's plan, and even continue it themselves.
 * Wild Card: Change in Management: The Courier must obtain the platinum chip, assassinate Mr. House, and install Yes Man's A.I. in the Lucky 38 mainframe.
 * Wild Card: You and What Army?: The Courier must travel east of the Colorado River to the Fort and activate an army of securitrons locked away in House's secret securitron vault.
 * Wild Card: Side Bets: The Courier can meet with the various tribes of the Mojave and decide who will be spared in the upcoming battle for Hoover Dam.
 * Wild Card: Finishing Touches: The Courier must convince Julie Farkas to support an independent Vegas; (optional) protect President Kimball against an assassination attempt; and use an override on the El Dorado substation in order to power the Lucky 38 and allow it to broadcast the securitron operating system upgrade.
 * No Gods, No Masters: The Courier must power up the secret Vault, allowing the securitrons within to break out and crush the Legion, before convincing the NCR to leave the Dam to Vegas - by force, if necessary.

Effects of the player's actions
After the assault on Hoover Dam, Yes Man informs the Courier that he has found pieces of code within Mr. House's mainframe that will "change his personality," and that he will seem to be offline for a little while until his personality change is complete. This personality change makes him more assertive, meaning that he will take orders only from the Courier in the future.

Appearances
Yes Man appears only in Fallout: New Vegas.

Behind the scenes
A "yes man" is someone who agrees to everything suggested by their superior, no matter what the task.