Chaos

Chaos is a thief from the GL era, and was originally a part of The Legendary Five, but after a certain quest he was transformed into a sword.

He is currently Rance's partner, and a counterpart to the Holy Sword Nikkou.

Personal History
GL0498 - He's born as a human, quickly gaining a reputation as a cunning thief and a master infiltrator. For the confusion he caused when stealing a high priority target, he's nicknamed "Chaos".

GL05?? - Chaos' lover, Gina, is murdered in front of him by a Dark Lord, he's driven into a deep depression. Soon after, he meets the Guardian Hero of the World, British. He joins his party "on a whim", telling nobody that his true purpose is vengeance.

GL0533 - The end of his humanity, Supreme God Planner grants his wish for "the power to defeat the Dark Lords", and he becomes a sword that can pierce the Invincibility Field.

GL0??? - Battlemage Gi somehow obtains Chaos, and uses him in a battle against Demon King Gele.

GL1000 - Demon King Gele is successfully sealed away by Gi, Chaos is the tool that kept her trapped.

LP0002 - 1017 years later, Rance unseals Chaos and uses him to defeat many Dark Lords. But Sel the Nun decided that he was much too dangerous and confiscated him from Rance.

LP0004 - Sel the Nun decides to throw away Chaos into the disposal labyrinth, Rance finds him and brings the sword with him.

LP0005 - Rance takes Chaos to JAPAN with him, Chaos senses the presence of Dark Lord Xavier. After 1500 years of separation, he is reunited with Nikkou at Honnouji temple. They defeat Xavier alongside Rance and Kentarou.

Appearance
Although he is referred to as "The Black Sword", his blade is actually a silver color.

He's far more lightweight than you'd expect.

He has three yellow eyes, two near the base of the hilt and one at the pommel, he has a decorative jewel between his eyes.

Personality
His character is very similar to Rance's, they both get along and considers Rance to be his soulmate.

He has an abnormal lust for slicing and killing Dark Lords, going into short excited speeches about it if given the chance.

Like Rance, he's motivated by a desire to smite evil and gain erotic things, he can generate a spiritual aura to perform sexual acts. He prefers rough sex, his favorite kind of girl is a naive westerner under the age of 20.

His goal is to defeat the Dark Lords and become human again.

Abilities
He can neutralize the Invincibility Field and damage Dark Lords. Even without that he is a powerful sword.

The sharpness of his blade depends on his motivation and his erotic thoughts.

He has the ability to gauge the power of enemies on the battlefield.

Unlike Nikkou, he cannot return to his human form at will, this bothers him because he wants his old body back. He can summon spirit tentacles, a kind of aura he generates to interact with the world, usually for erotic purposes.

He can be wielded by anyone as long as they have a strong will, if the wielder of Chaos has a weaker ego than him, their mind would be overwritten and Chaos would be able to control them.