Zer0

Zer0 is the playable Assassin class character in Borderlands 2.

It was revealed on February 21, 2012, in the Borderlands 2 Launch Date Trailer. Its origins, nature, and even real name are as of yet unknown. It is simply called "Zer0" because when it dispatches an enemy it displays a "0" on its faceplate. Other emotes, such as a "smiley face," pop up on his faceplate during different actions.

Skills
Action Skill: Decepti0n

Decepti0n grants Zer0 the ability to deploy a holographic decoy of itself and enter an invisible "stealth mode." While cloaked, it can maneuver about the battlefield dealing amplified damage on its next attack. The longer Zer0 stays cloaked the more damage it can inflict to enemies; however, the shorter Zer0 stays cloaked, the sooner it is able to use the skill again. Zer0 does not enter a separate dimension like Lilith when she Phasewalks, and can still take damage from grenades and other forms of splash damage while cloaked.

Decepti0n has a base cooldown of 15 seconds and gives up to +650% Melee Damage or +200% Gun Damage and +250% Gun Critical Hit Damage.

Sniping
This tree focuses on guns, particularly sniper rifles.

Cunning
This tree focuses on improving Decepti0n, and abilities that benefit both ranged and melee combat.

Bloodshed
This tree focuses on melee attacks.

Melee Weapon
Zer0's basic melee attack uses his sword. The sword is not an equippable item but its effectiveness in combat can be enhanced. The sword's hilt "exists" but the blade digistructs when the hilt is pulled from its sheathe.

Trivia

 * Gearbox concept designer, Scott Kester, credits Zer0's inspiration to "loner characters" like Snake Eyes from G.I. Joe and Gray Fox from the Metal Gear video game series.
 * Zer0's Class Mod is represented by an attachment on his elbow.
 * The bounty on Zer0's head is $32,000,000,000.00
 * One of Zer0's dialogue lines when using Decepti0n ("Hilarious, you've just set off my trap card!") is a reference to the anime Yu-Gi-Oh where characters would often say the same thing when revealing a trap card. The term is also used as an internet meme, usually said after a successful deception of someone else.
 * Most of Zer0's taunts are said as haiku's.
 * One of Zer0's heads, known as "Alienati0n" is a reference to the Alien franchise.
 * One of Zer0's skins, called "Why so Serious?"(a black and green color swap of his default costume) is a reference to an iconic line in the movie The Dark Knight.
 * If you listen when Zer0 is intruduced in the doomsday trailer, you can hear him say "September 18, 2012," The release date of Boarderlands 2. He also says it again, later in the video.