A hacking entity in Gacha Online. Alias: Server Destroyer HP: 10, but immune to physical attacks. An alternate timeline Sans from Undertale. Gender: Male Becomes stronger as the kill count increases. Current kill count: 9.77 million 1 Reset Skill 1: Black Error Bone Barrage Skill 2: Giant Black Error Bone Barrage Skill 3: Black Error Gaster Blaster Fire Skill 4: Multiple Black Error Gaster Blaster Fire Skill 5: Giant Black Error Gaster Blaster Fire Skill 6: Black Gaster Blaster that bites the opponent, flies high, and self-destructs Skill 7: Black Trident Slash Skill 8: Thread Attack Skill 9: Dual Orbit Gaster Blaster Skill 10: Kilael's Domain One of the Gacha Online terrorists and is as powerful as a boss mob. Long-time friend of Azi. He has ruined servers with Azi before. Officially, Kilael is much stronger than Azi. He is also a tsundere. Born from past trauma, he first fell from a pacifist to an entity called ERROR909, then turned into the Server Destroyer after even worse trauma. It is the memory of losing someone precious. Appearance: A black skeleton with a constant smiling mouth, white pupils inside his eyes, wearing a black jacket and a dark gray hoodie. He holds a black ERROR trident in his hand. A black aura and black ERROR signs appear around his body. For a skeleton, he looks quite cool and handsome. Apparently, purification is possible if a precious person or a specific individual comforts him. Hundreds of years ago, he was a happy, normal Sans.

A hacking entity in Gacha Online. Alias: SG Leader of the SG Unit HP: 77,500 An alternate timeline Sans from Undertale. Gender: Male Current kill count: 4.32 million Skill 1: Gunfire Barrage Skill 2: Normal Bone Barrage Skill 3: Gaster Blaster wearing an SG hat Skill 4: Multiple SG Hat Gaster Blasters Skill 5: Nuclear Missile Launch Skill 6: Summons 16 People's Army soldiers for a collective barrage Skill 7: Summons Fighter Jets One of the Gacha Online terrorists. Long-time friend of Kilael and Kamen. Appearance: A white skeleton with a smile, wearing a North Korean officer's uniform, carrying a powerful pistol, wearing a Japanese military cap with 'SG' written on it, and has red pupils. In the early days, he was hostile toward Kilael, but now they are best buddies. He also researches scripts. He likes game development.

A hacking entity in Gacha Online. Alias: ODL An entity who received upgrades from Kilael HP: 83,500 An alternate timeline Sans from Undertale. Gender: Male Current kill count: 2.16 million Skill 1: Cannon Shockwave Skill 2: Cannon Fire Skill 3: Cannon Laser Fire Skill 4: Red ERROR Bone Skill 5: Red ERROR Gaster Blaster Fire Skill 6: Giant Red ERROR Gaster Blaster Fire One of the Gacha Online terrorists. Long-time friend of Kilael and Azi. He was Kilael's subordinate before Kilael's corruption, but now they are effectively friends. Appearance: A black skeleton with dark red outlines, and a large red energy cannon is mounted on his right arm. One eye is covered, he has a dark red aura, and red pupils.