"Ansem" appears in Kingdom Hearts as the game's main antagonist. Devoid of a body, he watches Maleficent do his dirty work in gathering the Princesses of Hearts. Once Maleficent served her purpose, Ansem possesses Riku's body to regain a physical presence while dealing with Sora at the End of the World. Although his goal of reaching Kingdom Hearts is realized, the light behind the door to Kingdom Hearts destroys him, causing most of the worlds he destroyed to be restored while the others entered in a state of sleep. But in Kingdom Hearts: Chain of Memories, Ansem is revealed to still exist and attempted to take over Riku again within Castle Oblivion. However, Riku subdued Ansem and eventually uses the villain's power before the essence of Xehanort's Heartless was purged from him prior to his battle with Xemnas. Ansem reappears as one of the main antagonists for Kingdom Hearts 3D: Dream Drop Distance, having being brought from a moment in time by Young Xehanort. Ansem takes advantage of the Sleeping Worlds to mess with Riku by attempting to open the youth's heart to darkness again. After being defeated by Riku in the Sleeping World version of the World That Never Was, later appearing in the Organization's attire, Ansem attacks Riku and Mickey to hinder them from interfering in Xehanort's attempt to convert Sora. By that time, it is revealed that Xehanort's scheme included Ansem making use of the bodiless form to make contact with Young Xehanort to enact the back-up plan. Ansem is voiced by Akio ÅŒtsuka in the Japanese version of the series. In the English version, the character was originally voiced by Billy Zane in Kingdom Hearts and now by Richard Epcar in all subsequent releases/remakes. (Source: Wikipedia)
The queen of Attica is the person who Atropa threat of death that leads him to prophesy falsely. She wants her son to rise to the throne and is willing to do anything for this to achieve his goal.
A normal human that does some part time work to pay the rent and treat his sickly younger brother. One night he was killed by Demon Necromancer Serin and brought back as an undead. Due the traits of a zombie, sucking life force out of beings near him, he is forced to move out of the human world, joining Serin in the world of "Chaos." Vowing one day to return to the human world to the side of his little brother, Jae Jyuk has to earn the right to possess the "Goblin Fire," which can open the door to the human world. For one to obtain the rights, one must've attained a rightful amount of power. Now, Jae Hyuk is looking for ways to obtain power, so he can one day meet his little brother again in the human world. Jae Hyuk finds out that he is a "Negative," meaning his kind of power works differently from those with "Postive" magic power. He gains the mana stone known as "Depore" in a tower and is forced to fight and learn about negative magic. In order to control Depore he must have a strong desire, which is in this case, being with Serin. - Cavalier of the Abyss - (Immortal Regis Part 2) After a long series of events concerning Caladbolg, Jae Hyuk, now known as Regis Nex, eliminates anyone who seems to be siding with the Night clan, or the supporters of Caladbolg. He has taken an interest in Xix, who appears to be another undead, and wishes to know who his contractor, or master is, who has turned him undead.
Head of the Vision clan.He can see the future. 400 years ago, he was the great destroyer Noche, who grew attached to Karladbolg than any other king. He led Chaos almost to destruction and the effects were devastating. Because he was undead human, Karladbolg chose him to be his shell. Noche also had a contract with Depore.
Serin's father and head of the demon clan. Navarus is the one who brought Just to Regis and is claiming Just to be Regi's son. Navarus reason for doing this action is likely to rescue Serin from her imprisonment.
Jae Hyuk's little brother who is very ill and the reason his brother tries to return to Earth from Chaos. It is revealed that he was brought to Chaos by Serin to make up to Jae Hyuk for all that had gone wrong; unintentionally this lead to him turning into the Caladbolg.