Shikoutei

Shikoutei in on'yomi (始皇帝, or Qin Shi Huang in pinyin) is the first emperor of unified China, being originally from the Kouga/Huanghe (黄河, lit. Yellow River) Civilization. Like other figures such as Jesus and Buddha, he is instead alternately portrayed as a shaman who appears in the Shaman King: Legacy of Spirits video game series.

Abilities and Powers
With the machine's power, he is extremely powerful. It is implied he can take down Asakura Hao, but given their meeting was during Hao's first incarnation 1000 years ago, it is questionable if Shikoutei can defeat Hao in his current life. Drawing energy from Tao Ren, Horohoro, and Ryu increase his strength, though he is still unable to defeat Yoh.

Past
In the past, it was stated that 1,000 years ago, he met a shaman very similar to Yoh. He built an underground tomb to hide from him and the Great Spirit. During this time he created a machine that enabled him to drain Furyoku from other shamans to increase his power.

Shaman King: Legacy of Spirits
He causes a rift in time, causing even the Great Spirit to disappear. He forms many apparitions of famous Chinese mythological/historical figures (ranging from Sanzang/Sanzō of Journey to the West and Zhuge Liang/Shokatsuryō A.K.A Kongming/Kōmei from The Three Kingdoms) as well as many of Yoh's friends to misguide Yoh but at the same time (in terms of the latter) try to discover the culprit behind the mess.

The apparitions are later discovered to be Over Soul crystals manipulated by Shikoutei, and thus are bound to his control despite having some form of free will.

As He reveals to Yoh his name and motives as he possesses Zhuge Liang. After a fight, Zhuge Liang breaks free from his control and soon tells of what has happened to Yoh's friends and where they are being captured. Zhuge Liang, along with fellow Shu Kingdom comrades Liu Bei, Guan Yu and Zhang Fei who were all manipulated and created by Shikoutei, disappear after giving their final words to Yoh.

He is weakened when Yoh finds the machine and frees the people trapped in it. Afterward, Yoh defeats him in combat and Shikoutei dies to realize his own foolishness.

Trivia

 * Shikoutei is the strongest enemy in the game, but only if Yoh does not free the shamans he has imprisoned to lower his power to a more reasonable level. Otherwise, he would be impossible to defeat as his high amount of HP and fairly damaging attacks will grind through much of the player's party.