Developer

A Developer (デベロッパー, Deberoppa) is considered both the single most valuable players of Sword Art Online, and at the same time, the most dangerous. A developer is a player in Sword Art Online who, prior to being trapped in the game, had a direct hand in the design and creation of the game itself. Because of this they are considered the single most valuable and lethal players of the game at the same time due to their knowledge of exploits, game functions, and ability to take advantage of loopholes in the game.