Kierian Haven (Anime)

Kierian Haven, known as Keiichi Haven in the manga version, is the main protagonist of the Rising Beginnings Arc and Advanced Battle Arc of Re:Evershade. He appears prominently in the Final Endings Arc and briefly in the Regional Crusaders Arc. Kierian begins as a delinquent living in the woods and bent on gaining power and controlling East City. Kierian is part of a close-knit group of friends: Chloe Wheeler, Sky Violette, Blane Camus, and Russell Johnson.

Through conflicts with the Chaos Agency, the Alliance, and Zeno, he becomes stronger and redeems himself, learning the way of the Gold Experience. He becomes aware of his demon side after the fall of Division X and begins traveling alone for over a decade until returning to free his friends from their petrified state.

After the Grand Championship, Kierian completely fuses with his demon side, using demon magic to aid Sam and Summer against the Evolutionary, and Axel, and Serena in the last battle against Azazel.

Etymology
In the original Evershade manga, his name is Keiichi Haven. His given name has various meanings, with the main ones being "respectful, noble, first (son)", which likely reflects him being the eldest between him and Katherine. His surname is a reference to another character from a previous series by Alex Guy.

In the anime adaptation of the series, Re:Evershade, he is known as Kierian Haven. His given name means "little dark one, dark/black haired", which could reflect his earlier, darker personality and demon side. It also could be an anglicization of his original name.

Attack on Doomspire
=== Stardust Frontier arc (2038)

Overall Abilities
Kierian possesses similar abilities to his manga counterpart.
 * Immense Strength: Kierian's most distinguishable trait is his unnatural levels of strength. Five punches from Kierian could disorient a rampaging mutant. Despite this, his strength was not overly impressive and gradually increased. However, after awakening his demon powers, Kierian's physical abilities increased dramatically, giving him the strength to completely destroy several blocks from the wind pressure his punches make.
 * Super Jumping/Leaping: He is able to jump several feet off the ground and leap several stories in a single bound without having to fly.
 * Immense Speed: In conjunction with his high level of physical strength, Kierian possesses an equally impressive amount of speed. When he arrived at Ultimate City, he moved a remarkable distance and simultaneously incapacitated villains in the blink of an eye. Axel and Serena even stated that they were completely unable to track his movements despite the latter being slower than he once was. However, according to Kierian himself, he is slower than he was seventy years ago.
 * Immense Durability: With his cells enhanced by the Evolutionary's super-soldier serum, Kierian's bodily durability is considerably stronger than even the densest of Earth's metals such as steel.
 * Immense Stamina: It was noticed that Kierian has never been shown to be tired even when fighting against multiple villains. The only time that Kierian was shown to be panting and out of breath was against his battles with Dakera, demon scientist Demora, and Reign, and that was only due to either being weakened by the Chaos Agency's technology or his advanced age, which also limited Kierian from using the maximum output of his demon abilities.
 * Expert-Master hand-to-hand combatant/Martial artist: Kierian is proven to be a highly skilled hand-to-hand combatant and martial artist, as his combat skills are great enough to be able not only to fight on par against other very physically powerful experts of hand-to-hand combat and martial arts but also to defeat them single-handedly.

Gold Experience
Kierian and his group first seek Master Scarlet's tutelage in the ways of magic in order to fight the Chaos Agency more effectively. As a result, Kierian learns the art of the Gold Experience, a form of magic passed down from generations.

Demon Magic
As a test subject for the Evolutionary, Kierian was infused with demon-like cells and thus possesses great psychic and demonic power, however, he does not the same aptitude for it as Demora, since Kierian is not a full demon. He also noticeably lacks a few abilities from his original counterpart, Keiichi.
 * Transformation: Kierian can transform between his human and demon forms at will, provided he has enough energy or magic. When running low, he automatically takes human form. When he regains his energy, Kierian undergoes a drastic change in his physical appearance, gaining an extremely robust body, claws, hooves, and horns.
 * Magical Combat: He was seen projecting powerful energy blasts and defending with shields against his opponents in the final battle with the Evolutionary.
 * Teleportation: Kierian is able to teleport with another person in tow, as shown when he used it to help Sam and Summer flee from Demora. The limitation, though, is that he is only able to teleport fifty feet away and continued use will eventually drain energy.
 * Forcefield Generation: He created one to protect him, Sam and Summer from Demora's barrage of energy bullets. In his demon form, he made individual shields for dozens of people to protect them from falling rubble.
 * Demonic Weaponry: He can summon various "demon weaponry", with his signature and favored combat weapon being a sword.