Genesis

Genesis (ジェネシス) is a game adaptation-original character introduced in Sword Art Online: Hollow Realization. He is known as the «Black Swordsman» (黒の剣士) by the players of Sword Art: Origin. It was later revealed that he is a famous hacker known as the «God of Cheats» (ゴッド オブ チート).

Personality
Genesis is known to get strange looks when he is fixated on combat and he enjoys stealing hard-earned kills from other players. He has no regard for Non-Player Characters (NPCs), considering them unworthy of his attention.

Background
Genesis hacked the safety features of his AmuSphere in order to use a cheat called the «digital drug» without being ejected from the game by the AmuSphere's player protection protocol. Using this method, he can sharply increase his status, allowing him to engage any enemy in battle. However, long term use of this cheat harms his body, as shown when he was forced to surrender while fighting Asuna due to feeling intense pain.

Hollow Realization
While Kirito and Argo were attempting to clear an obstacle hindering their progress through the Oldrobe Forest, Genesis was surrounded by other players, who angrily complained to him for stealing their kills, but he only mocked the players before departing.

Later, when Kirito, Asuna, Sinon, and Yuuki were gathering ingredients in the field for cooking, Genesis was occupied fighting against a monster. Though his movements were fluid and natural, they appeared to be forced, as if he was not putting all of his effort into them.

After rumors of Kirito saving an NPC from being sacrificed to a monster by other players spread, Genesis decided to see Kirito for himself, but was disappointed when the latter failed to meet his expectations. When challenged to a duel during their encounter, Genesis rejected the request, deeming Kirito to be not worth the effort, and dismissively wished him good luck with his reputation, before leaving.

Later, in the field, Genesis was fighting a dragon when Kirito's group encountered him. As Genesis was being overwhelmed, he was offered assistance by Klein, but Genesis bluntly rejected the offer and ordered them not to intervene. At that moment he activated his digital drug through the in-game menu, gaining a boost in energy. After loudly boasting of his newfound strength, he successfully unleashed a series of devastating, reckless counterattacks on the dragon, defeating it. Gloating over his victory, he belittled Kirito for requiring assistance to beat the boss earlier. Ignoring Klein's outraged retort, Genesis declared himself to be a class above the others, and warned Kirito he would soon demonstrate that he is not as special as he believed, before departing the area.

While Kirito, Asuna, and Yuuki were escorting Premiere to a place potentially related to her quest, Genesis was angrily harassed by several players for thieving their kills. Dismissing their complaints and skills, Genesis slowly grew impatient with their escalating condemnations and challenged them to prove their ability to stop him. At one of the players' accusation that he was unaware of who he was dealing with, Genesis lost his temper and drew his sword, declaring that people like them had no place in the world and thus threatened to annihilate them. As he disappointedly watched the other players leave rather than fight him, he saw Kirito observing the entire incident. Noticing Premiere nearby, Genesis accused Kirito of using her to roleplay as the hero, and exited the location.

While traversing the Jeweled Peak Lakes, Genesis defeated a monster that he believed to be the Area Boss, and thus quickly spread the word of his deed. Upon meeting Kirito in the Town of Beginnings shortly thereafter, he bragged of his accomplishment, slighting Kirito's circle of friends and the other clearing guilds in the process. Attributing the lack of the next area opening to closed beta restrictions, he casually instructed Kirito to focus on completing quests for the NPCs.

Genesis' glory was short-lived, however, as he soon learned that the enemy he had fought was a decoy, while the real boss was dispatched by Kirito's group. Angered by this, Genesis approached Kirito in town to validate the news, voicing his disbelief at the confirmation and at Kirito's motivation for continuing the game. When Agil explained they received a different result because of their different intentions, Genesis denounced their beliefs and proclaimed his view that only the strong were meant to rule in the virtual world, declaring that they would soon come to understand this, before leaving in rage.

While cursing the developers for creating such plot twists, as well as Kirito and his friends for surviving the boss fight, Genesis encountered the Other Goddess wandering the streets. Initially mistaking her for Premiere, Genesis wondered why Kirito's group spent a large amount of their time with an NPC like her, suspecting they were aware of something about her that was beyond his knowledge, much like with the boss.

Sometime later, Genesis secretly spied on Kirito's group as they hacked into an administrator console in the Kurjiez Desert. From this, he discovered that the Cardinal System had activated the Ground Quest, Sword Art: Origin's Grand Quest which was still in development, and altered it to enforce the creation and destruction of Aincrad. Excited by the rare opportunity to destroy an entire virtual world, Genesis decided to start the quest himself and see Ainground burn to ashes.

Not long afterwards, Genesis found the location of the fifth Sacred Stone and claimed it with the aid of the Other Goddess, whom he named Tia. When Kirito and Premiere arrived at the dungeon and searched fruitlessly for the stone, Genesis revealed his presence and possession of the stone, mocking Kirito for his inability to understand what had transpired, before unveiling his control of the Other Goddess. Declaring that they had been working on the same quest, Genesis offered Kirito to join forces with him and finish the quest together. When Kirito protested and tried to warn him of the consequences, Genesis disclosed he was well aware of them. He also divulged his method of learning about them, as well as his motives for completing the quest. After one last taunt, he left the dungeon, ordering the Other Goddess to follow him.

While Kirito and the others were determining how to remove a barrier obstructing the desert, Genesis busied himself teaching Tia to fight with a rapier, deeming that she needed to do her share of the work. When she lost her footing against a monster, Genesis quickly intervened and dispatched it, criticizing her for her failure. At that moment, several orange players arrived and declared their intentions to settle their grievances with him. Genesis scornfully questioned their ability and willingness to defeat him, applying their own accusations of cowardice on them. However, he became surprised when the Other Goddess stepped in-between them, offering herself as their opponent, though when the players refused to fight, he ascribed their departure to their weakness.

Soon after the defeat of the boss of the Kurjiez Desert, Genesis arrived at a location that was accessible only if the player was partnered with one of the two Goddesses. When the NPC guarding the location refused to give him the last Sacred Stone without the presence of both Goddesses, Genesis ordered the Other Goddess to slaughter them mercilessly. When Kirito and Premiere arrived on the scene, Genesis immediately changed his focus to kidnapping Premiere. Genesis used Tia to distract Kirito, granting him the opportunity for an ambush. After executing the ambush, Genesis ordered the Other Goddess to deliver the final blow, but the attack was intercepted by Asuna, who then challenged Genesis to a fight. Before engaging in the fight, Genesis activated his digital drug; however, the use of the drug led to the premature end of the fight due to him suffering intense pain, which forced him and the Other Goddess to retreat. Before leaving, Genesis informed Kirito that their battle would continue at the Temple of Prayers, the final location of the quest.

Deep inside the temple, Genesis confronted Kirito in a one-on-one duel to decide the fate of Ainground. During the battle, Genesis invoked the digital drug in an attempt to crush Kirito, but was ultimately defeated, despite the boost he received.

Following his defeat, Genesis was arrested due to his actions being revealed to the public by Seven. His actions also prompted the game's development team to patch the game, resulting in fewer players using the drug.