Name: The Dark Lord of the Shadows/Makuta Teridax

Age: millions of years old 

Eye colour: red

Gender: male

Race: entity

Biography: An ancient, legendary, evil entity of darkness said to be the strongest, mightiest, most powerful being in all existence throughout the Universe. Like the Inheritor, it is said that he knows all and sees all that goes on in the Universe. Though the Dark Lord of the Shadows goes by many names, his real name is Makuta Teridax. 

Back then, when The Inheritor created the Universe, Teridax was once a Great Being alongside The Inheritor, and his brother, Mata Nui, but his ambition for ultimate power led him to betrayal. And thus, he took on a quest to conquer the Universe. After his brother, Mata Nui, defeated him on Bara Magna, Teridax came to learn about the Keyblade. 

He sensed its power and somehow came to wield a Keyblade of his own. Now, he is reborn into a powerful being of supreme evil. While The Inheritor believes that all living creatures are born to live in freedom and peace, Teridax views himself as a Titan/God to be feared and worshipped and that all creatures should be made his slaves. 

Thus, he has made it his mission to seek control over the ancient power of Kingdom Hearts and the X-blade in his ultimate ambition to conquer the Universe and enslave all living creatures.

What lies in his soul is Pure Evil, Hunger, Destruction, Domination, Ultimate Power, Darkness, Vengeance and Fear.

His Keyblade is known as Harbinger of Shadows, the most powerful Keyblade of Darkness. This Dark Keyblade was predominantly black and red. The blade was long, slim and extravagant with traces of black flesh on it. The teeth are diamond-shaped spikes that are connected by a black web structure. The shaft of the blade is a skull-shaped face in the middle with a menacing red eye of darkness with a black slit pupil situated just above the hilt. The Keyblade had a spiky, black guard with two crystalline demonic wings on its sides. The hilt was smooth and black. On the bottom of the black hilt of the Keyblade was a red oval glowing crystal gem. Its chain was very square and scary looking with four spikes on each side on each chain. The Keychain was shaped like a dark black flaming red eye with a black slit pupil. The Dark Keyblade also had evil twisted glowing red markings all over its teeth and blade. Both he and Lord Thanatos wield this Dark Keyblade (Modeled after the Cursed Sword: Soul Edge from the Soul Calibur Series).

Teridax has a muscular, well-developed physique, standing 8" feet tall in length. His body was of metal, bone, flesh, and dark energy. His head was a black devilish skull with his flaming, demonic eyes of pure evil, no nose, and a glowing red mouth full of sharp teeth. His hands were five-digit bony claws with glowing black-red evil energy on the back. Red dark energy, which stemmed from his evil heart, pulsed throughout his entire body like a heartbeat, seen through his veins. And his entire being radiated with a black aura of pure darkness, draining the light around him and creating waves of distortion in reality.

The Dark Lord was mostly clad in heavy black, red, gold armor, wearing a ribbed black-red skeletal chest plate with a dull blood-red section covering his torso and abdomen with a black-red crystal diamond spike in the center of a dark circular space, three curved, segmented gold plates going from large to small on his upper shoulders, gold pauldrons with black demonic skulls with ruby eyes built into them, gold armlets with black chains wrapped around them, and five-toed, knee-length, gold talon grieves on his feet. Over his head, Teridax wears a long black hood with the center shaped to resemble an eagle's beak, which is connected by rectangular silver chains to his armor, and a long, floor-length, tattered black cape. The Dark Lord also wears a black, spiked, square chain belt and a long, scaled fauld around his waist with a thick drape of black cloth lined vertically with a combination of ancient symbols such as the Roman numeral XIII at the top center, the Greek symbols of Alpha (α), Omega (Ω), Lambda (Λ), Sigma (Σ), Psi (Ψ) on the left, the Kanji symbols of Chaos (混), Death (死), Corruption (腐), Hunger (饿), Vengeance (復) in the center, and the Hebrew symbols of Darkness (חוֹשֶׁך), Power (כּוֹחַ), Fear (פַּחַד), Void (בָּטֵל), and Primordial (רֵאשִׁיתִי) on the right. There is also ancient runes and glyphs of unknown origin that lined the sides of the cloth vertically in ten small grey squares. Each of these symbols were black red in color with a glowing red outline.

The Dark Lord and The Inheritor took part in The Keyblade War, an ancient battle where he, The Inheritor, and the Forces of Light and Darkness clashed sides for control of Kingdom Hearts and the Universe in an epic battle. One that lasted for countless millennia.

The Dark Lord was Master of the Heartless, Nobodies, Unversed, Dream Eaters, Bohrok, Visorak, Rahkshi, and other Forces of Darkness. He was the leader of a dark empire known as The Dark Order, an empire consisting of many of his Dark Followers, Blood-thirsty Monsters, and Evil Warriors, including Outcasts, Betrayers, and Rogues that obeys his supreme power without question through absolute loyalty.

With his dark followers, The Dark Lord seeks to take control of Kingdom Hearts and use its ancient power to cast the Universe into everlasting shadow and bind all living things to his will. Many serve The Dark Lord in his quest for ultimate power and control. Every Villain throughout the history of the Universe serves The Dark Lord. Villains like Malefor, Red Death, Maleficent, you name it, they all follow him.

The Dark Lord has many powers and abilities at his disposal that are said to be equal to any being in the universe.

He can move at lightning speeds. Jump high long distances. Lift objects a billion times his size. Manipulate objects through sheer willpower. He can instantly adapt to the environment to take maximum advantage of any condition or situation. He has the power to turn one against one another in anger. 

Control devastating bolts of lightning that can leap between multiple targets. He can become completely invisible in any environment. He can consume all light in a large area and cast it into darkness. He has complete control over darkness itself. He can even awaken the darkness sealed in hearts and use it against others or use it to further his dark purpose.

He can even destroy anything in the Universe, including countless worlds. He can reduce anything to dust and rubble. Drain the life force of any living being and absorb it into his body. Create and control multiple realistic illusions. 

Bind others to his will with total control. Invade the minds of other beings and read their thoughts. Drive others into complete insanity and fear. Dangerously infect living beings with venomous toxins. 

Can take control and possess the body of any living being. Can see almost all things going on in the Universe. Can change size to massive proportions. Can instantly put an entire world or a living being into a deep slumber.

He is impervious to sub-zero temperatures and withstand intense heat. He can freeze a creature in near-permanent stasis through eye contact or by force of will. Can change the appearance of the stars in the night sky. Can change the weather and manifest powerful, dangerous thunderstorms, tornadoes, blizzards, even hurricanes at will.

He can summon the Undead, Heartless, Nobodies, the Unversed, and other dark creatures. He has immense resistance to pain and injury, making him nearly invincible and invulnerable to any attack. The Dark Lord even has God-like strength that could rip an entire world to pieces down to its very core.

His power is so great that he constantly radiates with pure darkness. Even the souls of his enemies have fused with his heart adding a more demonic tone in his voice which is what makes him so fearful.

This Dark Evil Being is truly a force to be reckoned with. No army, fleet, or the strongest, mightiest warrior or weapon can strike this Dark Lord of evil down. Not even The Inheritor himself could contend to The Dark Lord's infinite power. 

The Dark Lord's power exceeds beyond all other ancient beings. He is so powerful that his very presence strikes fear into the hearts of every living being in the Universe. Even the mere mention of his name can cause extreme horror. He is feared by all. The Dark Lord of the Shadows is true pure evil. He has no conscience. No Fear. No Weakness. He never forgives. Never forgets. And never stops.

The Dark Lord resides in The Realm of Shadows, an ancient, evil realm of darkness where all beings of evil dwell. It is also the source of all darkness. Heroes of light have attempted to face against The Dark Lord's supreme power but have failed countless times throughout countless years. Not one living soul in history has ever stood against The Dark Lord's evil power and survived.

His cruel heart knows no bounds. Many have been enslaved, tortured, slaughtered, and killed by The Dark Lord in his Palace of Shadows after they have failed to defeat him. In addition to his ruthlessness, Teridax collects skeletons, organs, and body parts of the victims he and his forces have slaughtered in a collection all throughout his Palace. 

The Dark Lord has also kidnapped countless numbers of young children who were destined Keyblade Wielders and a threat to his Dark Conquest. Regardless of age, race, or species whether they be children or adults, the Dark Lord shows no mercy, no disregard toward those who are a threat to him. 

Even more horrifying, he consumes the hearts and souls of young children and adults to satisfy his malicious bloodlust and undying hunger. Thus, he brings a new meaning to one of the most infamous evils throughout history: Fear. The Dark Lord is a true demon of the highest order.

The Dark Lord bears many titles: Overlord of Darkness, Demon of the Black Void, Destroyer of life, The All-Father of Evil, The Conqueror of Worlds, The Dark Emperor, a Great Being of Fear, The Omen of Death and Destruction, The Devourer of Souls, The Ultimate Evil, the list is endless. The Dark Lord is the embodiment of Evil, Death, Chaos, Darkness, and Destruction in all its forms.

The Dark Lord will stop at nothing until the entire Universe is enveloped in his dark, evil shadow and Kingdom Hearts and the X-Blade is in his possession. If the Dark Lord succeeds, he will gain complete Immortality and Total Omniscience. 

Upon achieving his victory, the Dark Lord will also gain Omnipresence making his dark presence known throughout existence, thus all would forever fear him without end. Eternal life, total knowledge, ultimate power and complete control would forever be in his grasp. 

This would mean the end of all life in existence which is why Devon, and his friends must succeed and that they must be ready to stand up against the Dark Lord of the Shadows in the Ultimate Final Battle for the Fate of the entire Universe.

Makuta Teridax is the true Dark Lord of all Evil and Shadow. All shall submit to his infinite God-like power or rot in the shadows for all eternity! Glory to the Dark Order! The Dark Lord of the Shadows is the Main Supreme Antagonist of the Kingdom Hearts Series.

For voice reference, The Dark Lord of the Shadows is voiced by Paul Nakauchi, the voice of Malthael in Diablo III: Reaper of Souls and J. B. Blanc, the voice of Diablo, the Prime Evil in Diablo III.