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The Character Hack (or Transform Hack) is an exploit that allows a Player to change to a different character model. This is usually combined with Aimbot, Superbullets, No Recoil, and Chams. As the name suggests, this hack allows a player to transform into other character models in any mode, which can change the statistics of the character for HP, AP and speed. However, they will retain all their original weapons.
When the player transforms, many attacks from enemies will be ineffective depending on which model they transform. This hack is very common, and easily noticeable, either by the weapon, or the game mode (Ex: A Super Spy without an Intel on his back and Dreadnought in a Quarantine Regen Match with a melee weapon).