The Paradox

 is a Gungeoneer added in the A Farewell to Arms Update. It costs 5 to play, and has no past. The Paradox starts with a random starting sidearm from the other gungeoneers (excluding the Slinger), as well as another random gun and a random passive item.

How to Unlock
The method to unlock the Paradox can only be accessed after killing at least one Past. In the Gungeon Proper, Black Powder Mine and the Hollow, there is a 20% chance that a cosmic rift will appear in a random room, which the player can walk into and interact with to receive a paradox effect. Killing the character's past or the Lich with the effect active will unlock The Paradox.

Multiple cosmic rifts can appear in one run, and they can also appear during a Rainbow Run.

Saving and quitting the game will no longer remove the effect as it did previously. Dying and respawning with a Clone will also retain the effect.

Bugs

 * For some unknown reason, for some players The Paradox might not even have the glitching effect when playing them, instead it will just roll through the Gungeoneers and their alternate skins when rolling or interacting with something like usual.
 * While playing as the Paradox, skipping a chamber can sometimes result in the Paradox not starting out with a passive item.
 * In Co-op mode:
 * If the Paradox drops their starter item and then dies, they'll be given another starter item, the same one they started out with. The Cultist can pick up the duplicated starter items and possibly stack its power.
 * Using the Save Button resets both players' loadouts. If either dies, they will respawn with a new starter item and weapon and drop their old ones. This enables one player to collect multiple starter guns.
 * If either player dies while Riddle of Lead is in their loadout, their ghost's health will be restored by its healing effect. This makes them unable to be revived. If the other player dies, both players continue to play as a ghost at the same time. In this state the game cannot be lost but is very prone to becoming softlocked.
 * If any of the players die with an item that increases heart containers, the killed player will never be revived. All chests that are opened from the remaining player will play the revival animation on them and recover their health. This can be fixed by saving and exiting to the next floor which will cause the killed player to be revived and drop the item and may cause them to drop their starting gun if killed again. This works if the killed player is the Paradox. (DestructiveUnggoy: This has been patched as far as I'm aware.)
 * If Macho Brace gets activated by a dodge roll, but a shot is not fired before the time limit, then the glow will not fade away (the actual damage increase will still disappear however). This can be fixed by activating Macho Brace again and firing a shot before the time limit.

Trivia

 * Nicknames that NPCs refer to the Paradox as include:
 * Whatever you are
 * Time blob
 * Glitch
 * Temporal horror
 * Purple ghost
 * On Switch, when changing controller while playing as The Paradox, the character name will instead appear as STRING_NOT_FOUND.
 * Although the Blacksmith will speak with the Paradox, they will not give them the Bullet That Can Kill The Past.