
(Wiki Article)
Hao Asakura is the main antagonist and the ancestor, twin brother and previous incarnation of Yoh Asakura, the main protagonist. The original Asakura Hao from 500 years ago was re-incarnated in the two of them.
A powerful shaman of the Asakura clan, he strived to become Shaman King one thousand years prior to the start of the story. He had mastered all the arts and techniques of Onmyoudou, including the ability to see the future, use reishi (soul sight), command powerful spirits and allow and control the circumstances of reincarnation.
Hao had the Reishi (a form of telepathy that allows the user to see the hearts of others), but he could not control the limit of the power. Because he lived in a time of war, disease, and famine (the Heian period), he attempted to help others with his powers. However, he began to see the darker side of human nature as he discovered through his reishi that those he helped were jealous and afraid of his power, and convinced themselves that he was evil.
His heart became consumed with hatred for humanity and began to plot the destruction of humanity by becoming Shaman King. He believes that by doing so, the planet and other animals that humans abused would be saved. In this time, he also allowed people to worship him as god, and appears to have developed a superiority complex, believing himself to be better to everyone; a delusion made more dangerous by his ability to back up this claim.
Hao is by far the most powerful and learned shaman who has ever lived. In his original life, he was already the strongest shaman of his day, but since learning the ways of reincarnation, he has become a truly powerful being, his strength many hundreds—perhaps many thousands—of times greater than his nearest rivals. Both the Shaman Council and his descendant's—in both the Asakura family and Silva's tribe—fear him greatly. They have sought to bar him from the Shaman tournament, but know this is impossible, in part because he distracts the brutal rival Shaman faction the X-Laws, but mainly because if they tried to stop him, they know they would have no way of winning.
Powers and abilities sad From Wiki)
As a result of Hao mastering all five elements, he can simply change the Spirit of Fire's element around as he wishes. However, while he doesn't use the Spirits of Earth or Water directly, but having mastered the elements, he can make Spirit of Fire change its element almost instantly. However, it does take quite a bit of concentration and power as he congratulates the X-Law for being able to "push him this far" before killing him.
Hao's original abilities of a taijitu master from his first life gives him full control over the elements and divination powers. He is not only able to manipulate the five elements of nature, fire, earth, wood, metal, and water materially, but also spiritually as shown when he converts the spirit of fire into the spirit of water. Even without the spirit of fire, Hao possesses great elemental and divination abilities and can easily bend oni and demigods to his will. However with the addition of the spirit of fire, one can only assume that he can greatly amplify the circular properties of his art by using the spirit of fire as a power source. However, the spirit of fire uses mostly physical attacks, and on occasion its fire attributes. Since Hao is fond of the element fire, he is rarely seen using his taijitu arts in both the manga and the anime. Nevertheless, the combination that his Onmyōdō abilities and the spirit of fire forms definitely gives him an oversoul second in power only to one with the great spirit.
Reishi (霊視)
This is the ability to read the hearts of others. Whilst in some ways a useful ability, it is incredibly hard to control, with the end result that Hao was constantly inundated with the thoughts of those surrounding him. As a result, his contempt for the human race grew until he sought to create a world of only shamans.
Taizanfukun no Sai (泰山府君祭)
Taizanfukun is the ancient Chinese name for the King of Hell, who judges the dead and decides their fate. It is through this technique that Hao was able to be reborn 500 years later as one of the Patch, and then again 500 years later.
Ring of Fire (リング・オブ・ファイアー)
An attack similar to that of Yoh's Shinkku Buddha Giri (Celestial Slash).
Kurobina (Manga only)
Hao's form of armor oversoul, it is first shown in chapter 233 when he used it to defend himself from a laser shot by a X-Law satellite. Like other armor oversouls, the power of Kurobina is immense as shown when Hao personally destroyed a fleet of battle ships sent from Manta's father. In this form, Hao is able to hover and fly in the air while also being able to fire immense blasts using the shuttle packs on his back.
Aang:

(Wiki Article)
When Aang was a child, he unknowingly revealed that he was the reincarnation of the Avatar when he chose four specific toys out of thousands. These four toys--a string-powered propeller (Air), a clay turtle flute (Water), a wooden Hog-Monkey (Earth) and a wooden hand drum (Fire)--were the same ones that past Avatars had chosen for generations when they were children. [2] This is the same procedure a child must go through in order to be recognized as the reincarnation of a Tulku Lama in Tibetan Buddhism. According to the book Magic and Mystery in Tibet by Alexandra David-Néel, “a number of objects such as rosaries, ritualistic implements, books, tea-cups,[3] etc., are placed together, and the child must pick out those which belonged to the late tulku, thus showing that he recognizes the things which were his in his previous life”.[4]
Raised by Airbender monks, Aang grew up in the idyllic surroundings of the Southern Air Temple. Aang was a carefree young boy, given to frequent travel, play, and possessing an almost effortless mastery over his native element. His world drastically changed when the monks revealed that he was the Avatar, destined to master all four elements and bring peace to the world.
Usually, the Avatar is told of his or her true identity only after turning sixteen; however, Aang's caretakers feared that a war between the Four Nations was on the horizon and believed that the Avatar would be needed to help maintain balance. Aang soon began to feel overwhelmed with the burden of his position. His peers ostracized him for his airbending skill, while his caretakers pressured him to mature too quickly.
The only monk sympathetic to Aang's feelings was the elder Monk Gyatso, Aang's Airbending teacher and guardian. When the burden weighed heavily on his favorite student, Gyatso worked to instill a sense of fun through jokes and games. He sincerely believed that Aang should be allowed to grow up as a normal boy. However, the other monks disagreed. Citing Gyatso's attachment to the boy as an interference, they decided to send Aang away to the Eastern Air Temple to focus on his training, oblivious to the fact that Aang had overheard their caucus.
Confused and frightened by what he had learned, Aang fled from his home on his flying bison, Appa, towards the South Pole. While over the Southern ocean, a sudden storm caused Appa to plunge deep into the sea. Entering the Avatar State, Aang reflexively used a combination of Airbending and Waterbending to surround himself and Appa in an air bubble that quickly froze into an iceberg, putting them into a state of suspended animation[2] for the next hundred years.[5]
Powers and abilities sad Also from Wiki)
As the incarnation of the Avatar, Aang possesses the ability to manipulate all four elements. He is already an Airbending master and has made impressive progress with the other elements. Though he is able to master techniques with more ease than his young Waterbender friend Katara,[12] his lack of focus has allowed her to surpass him.[15]Now he must learn from her, as their teacher Master Pakku deemed her a master.[13] He is an extremely skilled Waterbender, and in the episode "Bitter Work," Katara tells Aang he has the reflexes of a Waterbending Master.[18]
The Earthbending style is the opposing style to his natural Airbending, and as such conflicts with his natural personality. At first, Aang's Earthbending abilities appeared stunted, as he has difficulty learning simple skills from Toph in Bitter Work as it was easier for Aang to simply avoid the obstacles physically. However, when he confronted with a need for direct opposition, rather than avoidance, he took his first step and successfully stood his ground to defend Sokka, who couldn't defend himself, and now Aang was able to assume the position of an Earthbender.[18] By the time of "The Drill," his skills have improved dramatically, when he comfortably uses Earthbending in combat against Azula. [19] He appears to have achieved mastery in Earthbending by the time of "The Tales of Ba Sing Se," creating a giant zoo with his bending,[20] and by fending off hundreds of Earthbenders in "The Earth King."[21] Later, he incorporates his Airbender's staff into his Earthbending, much like Avatar Kyoshi incorporates her fans into her bending.[22] It is possible for Aang to bend two elements at the same time, as demonstrated in "The Tales of Ba Sing Se."[20] He has little skill with fire, but has received a rudimentary object lesson in breath control and Firebending. When he was briefly instructed by the fugitive Firebending master Jeong Jeong, he ignored warnings to restrain himself and accidentally burned Katara (leading inadvertently to the discovery of her healing powers).[23] Newly respectful of fire's destructive power, he has not used Firebending since, and has even vowed to never firebend again, although, as Guru Pathik said in "The Guru," he will eventually have to, as he is the Avatar, therefore he is a Firebender. [24]
As the Avatar, Aang is quite possibly the most powerful Bender in the world; he once used his Airbending skills to halt a massive lava flow without entering the Avatar State.[25] Additionally, Aang has exceptional natural talent towards all bending, performing Waterbending on his first try when Katara took several months to learn the same move,[12] and assuming a perfect Earthbending stance on his first try.[18] However, Aang is loathe to use his skills in battle, preferring to solve problems non-violently. Even when forced into combat, Aang typically holds back, fighting defensively and trying to subdue opponents without seriously hurting them, even if they are not human. [9] This attitude was apparently common among Airbenders, who were all vegetarians and taught that all living things are precious.
The only exception to Aang's pacifism is when his friends are threatened; in which case, he gets very angry and relentlessly attacks his opponents, sometimes even entering the Avatar State.[22]
In The Deserter, Jeong Jeong says that to master firebending, Aang, as the Avatar, will need to first master the other Bending Arts in order and not to deviate from their natural order--Air, Water, Earth and Fire--hinting that the disciplines of one Bending Art will support the disciplines of the next Bending Art in order--'evade and avoid' - 'redirect and turn against the opponent' - 'standing ones ground and enduring' and 'preemptive first strike'. In Bitter Work, Iroh comments "It is important to draw wisdom from many different places. If we take it from only one place, it becomes rigid and stale. Understanding others, the other elements, and the other nations will help you become whole...It is the combination of the four elements in one person that makes the Avatar so powerful," as he reveals how a waterbender's technique of redirecting energy enabled him to develop his own technique to redirect a bolt of lightning--proving that the disciplines and principles of one Bending Art support the disciplines and principles of another Bending Art.