Yami no Seiou

Yami no Seiou(闇の魂キング Dark soul King) is the Shichiban(七つ Seventh) Demon Lord.

History
Yami no Seiou was the head of the Shadow Demon clan.Some time after Yan Oh lost his rank as the 1st Demon Lord,he went to challenge the first Demon Lord.On his way,he met Zukai(who was the 7th Demon Lord at the time)he Challenged him and Defeated him,claiming his title.

Personally
Yami is a very cold, callous, dispassionate figure, and is rather aloof, brooding, and indifferent, willing to harm both his comrades and enemies should they ever get in his way. He refers to anyone he does not find interesting as "Dirt" and treats them as expendable. Despite this, he is not particularly violent, unlike most of his Demon Lord comrades, and will only fight when provoked or ordered to by Heishiro.Yami no Seiou has shown no regards for humans or Shinigami,seeing all of them as creatures to be used and than tossed away.Yami does not speak to many of the Demon Lords,unless at a meeting.

Powers & Abilities
Hand-to-Hand Combatant:Though he hasn't shown the extent of his abilities in this field as of yet, Yami has shown to rely mostly on hand-to-hand combat(Do to the fact that he has no weapon).

Keen Intellect: In addition to his remarkable combat prowess, Yami is also gifted with great insight and understanding to situations at hand. His intelligence is such that even Heishiro or Maiito, Two people arguably best-known for there intellect. Yami is the scout of the Demon Lords,Heishiro sends him to investigate the power and threat level of Others. With his calm and collected nature, Seiou has can be highly perceptive and analytical, allowing him to easily deduce the basic idea of his opponent's skills to figure out its strengths and weakness,making him one of the most intelligent Demon Lords.

Demon Arts master:Despite his rank,he has shown a high use in this skill.

Demonic step:He has shown profound use in this skill

Terepashi(テレパシー Telepathy):Seiou is one of the Demon Lords that uses this ability the most,and is the best at it.