The Robot

 is a secret unlockable Gungeoneer. The Robot begins with Robot's Right Hand, Coolant Leak, and Battery Bullets. It starts with 6 and no hearts, and heart containers cannot be gained. The Robot is also immune to damage from electrified water due to Battery Bullets.

Picking up Master Rounds grants The Robot a piece of armor. Additionally, picking up any items that grant heart containers gives 5 to 10.

Each piece of Junk or Gold Junk grants The Robot an additive 5% damage increase. This damage increase persists no matter what happens to the Junk.

The Robot also starts with a natural increase in accuracy due to Battery Bullets.

Defeating the High Dragun with the Robot unlocks Battery Bullets for all Gungeoneers.

How to Unlock
Bring the Busted Television to the Blacksmith in the Forge. This item can be found in the first elevator room at Gungeon Proper(floor 2) as soon as the first shortcut is unlocked.

Tips

 * Using the Busted Television throws it, which is often required to get it across pits.
 * Playing as The Pilot can help, as his Hidden Compartment allows him to carry the Busted Television without sacrificing the ability to use active items entirely.
 * One strategy is to intentionally drop this item every time you enter a room, ensuring that it is not accidentally dropped due to rolling.
 * Avoid dodge rolling to enter closed rooms and elevators, since the item will be stuck on the other side, potentially making it irretrievable.
 * Waiting until you get to the end of the Gungeon Proper and then getting the television can save some hassle.

Story
The Robot was an honored member of the killbot army. When commanded by its master, EMP-R0R to kill the leader of the human resistance, it broke protocol, failing to eliminate humanity.

Past Kill
If the Bullet That Can Kill The Past is used on The Robot, it will be brought back to the Emperor's Arena. Instead of breaking protocol, it successfully eliminates The Last Human. With its purpose fulfilled, it is powered down. This unlocks Chest Teleporter and Robot's Left Hand.

Strategy
The Robot is a unique Gungeoneer due to its armor-as-health gimmick: it starts off with the equivalent of 3 heart containers worth of armor, and cannot gain health containers or pick up health at all. This has its own perks and drawbacks: on one hand, the armor gives the Robot a free blank effect every time it is hit, giving it instant breathing room and making it more likely for the player to find Secret Rooms. It also negates the full heart of damage that jammed enemies usually deal, allowing it to fare better during runs with high curse. On the other hand, armor is completely lost upon hit unlike hearts, and armor pieces are harder to find compared to heart pieces; this usually results in the player having to spend shells in the shop to recover hit points. This makes it likely for players to have insufficient funds for quests as the run progresses, such as those for shortcuts or the Resourceful Rat's Lair. Note that this has been fixed somewhat as of the Advanced Gungeons & Draguns Update, as any item that would usually give it a health upgrade (apart from the Master Rounds, which grant one armor) will give a small amount of, making it slightly easier to purchase extra armor or other items. Due to the Robot technically having zero health, some items will work differently for it than for other Gungeoneers. For example, Riddle of Lead will always give it a 50% chance to negate damage, but Blasphemy will never shoot sword beams.

The Robot also has another perk: every piece of Junk gives it a small additive damage increase. This turns a usually pointless item into a useful commodity, as chests that the player deems useless or unopenable can be destroyed and still grant the Robot's guns a gradual damage boost. Indeed, it is sometimes wiser to destroy chests (especially those of lower quality) in the hopes of getting Junk instead of purchasing a key to open it, as the money could then be used to purchase armor instead. This damage buff is especially useful due to the Robot's starter gun, the Robot's Right Hand, which is commonly considered one of the best starting guns due to its dependable damage, firing speed and reload time, alongside its substantial clip size and accuracy; with enough junk, the Robot can sustain itself with just its starter weapon as a room clearer. Finally, Battery Bullets gives all of the Robot's guns double accuracy and makes it completely immune to electrified water; Coolant Leak also acts as a pseudo Molotov that the Robot can simply walk over with impunity while firing at enemies, and gives it guaranteed access to the fireplace secret in the first chamber.

Overall, the Robot is best used in the hands of players that can use its tools to the fullest capacity while being hit as little as possible: its strong starting gun, armor and junk gimmick are excellent tools that can substantially boost the Robot's effectiveness as the run progresses, though any lost hit points are likely to stack up against the player compared to the other Gungeoneers. It can essentially be considered a "glass cannon" of the playable characters, as it has many perks that can quickly turn sour if the user is careless.

Unlock Dialogue
When speaking to the Blacksmith In the Forge:
 * "That television! There's something about it... May I have it?"

Here you go. = No=
 * Blacksmith : "Thank you. One moment..."
 * The Robot : "[][][][][][][][][]^{}***!" (Teleports away)
 * Blacksmith : "I guess he had somewhere to be?"
 * Blacksmith : "Oh. Why did you bring it all the way down here, then?"

Trivia

 * Nicknames that NPCs refer to the Robot as include:
 * Machine
 * Automaton
 * Android
 * Mechano-man
 * Can-opener
 * Robert
 * Number 4
 * Colonel Klink
 * Toaster
 * Metal Head
 * Prior to patch 1.0.7, The Robot didn't get any armor from picking up Master Rounds.
 * Prior to the Advanced Gungeons & Draguns Update, The Robot did not get from items that grant heart containers.
 * The nickname "Colonel Klink" is possibly a reference to the old American television show, Hogan's Heroes, where Colonel Klink fits in the role of an oblivious colonel at a WWII camp.
 * The nickname "Number 4" is possibly a reference to the movie Short Circuit, where the main character is named Number 5.
 * The Robot's starting gun is called "Robot's Right Hand"; however, the art for the boss versus screen shows it readying its left hand, and not its right. This could be because of an inconsistency created by mirroring the art or, while unlikely, an implication that The Robot has swapped hands as to keep firing with its dominant hand.
 * The Robot's past and alternate costume are references to the Terminator franchise.
 * The minions summoned by the Last Human resemble the T-800 Terminators.
 * The beginning of The Robot's past where he boots up is the same as the T-800 Terminator boot-up, with the red screen and systems activating.
 * EMP-R0R's appearance is a reference to Hal 9000.
 * The arena's walls are filled with references to various franchises and games including (but not limited to):
 * A drawing of Mettaton from the game Undertale.
 * "Bots don't shiv" is a reference to the phrase "I don't shiv" from Batman: The Dark Knight Returns.
 * A drawing of a Reaper from the game Mass Effect
 * A drawing that refers to a jailbot of Superjail!.
 * A drawing of the "Robotology" religion symbol from Futurama.
 * A drawing of a Cylon from the Battlestar Galactica franchise.
 * A pair of drawings of Tom Servo and Crow T. Robot from Mystery Science Theater 3000.
 * A pair of drawings of Atlas and P-Body from the game Portal 2.
 * A drawing of an E Tank from the Megaman franchise.
 * Eight empty squares surrounding a "W" in the center, referencing the stage select screens from the Megaman franchise.
 * The robot sitting beside EMP-R0R resembles a sentinel from the Matrix franchise.
 * The minions of the Last Human turn into critters upon death. This is a reference to the Sonic franchise.
 * The other robots talk to each other using the word 'ye'. This is a reference to Futurama.
 * Next to EMP-R0R stands a device resembling a hookah except with a plug, a reference to the act of "jacking off" from Futurama.
 * EMP-R0R's pose and Roman styling may be a reference to Hedonismbot from Futurama.
 * According to the Ammonomicon entry for Robot's Left Hand, the Robot, as well as most other robots, is left-handed.
 * The Robot's face is made of keyboard symbols.
 * This character may be inspired by "??? (Blue Baby)" From The Binding of Isaac.