Arkham

Arkham is the main antagonist of Devil May Cry 3: Dante's Awakening, he is human who became a demon after killing his wife, he wishes to have the power of the legendary demon known as Sparda that is father of Dante and Vergil.

Biography
Very little is revealed about his past; what is known is that he began to investigate on demonic magic and killed his own wife to become a demon what actually happened, which resulted in his revolting daughter Mary who changed her name for Lady, to have a strong hatred against him and the demons, and wanted to avenge the death of his mother, Arkham soon had decided that he wanted the power of Sparda and began to investigate the Temen-ni-gru.

Knowing Vergil
He soon met one of Sparda's sons, Vergil, and told him about the seven in the tower. Vergil stood waiting in his mansion, Arkham searched for the names of the seals, which were necessary to be blocked.

Plot
Soon he found all the names of the seal, he and Vergil find the way to the base of the Temen-ni-gru where they wait for Dante, then Arkham went to take care of his daughter and threw her out of the tower. Arkham later appeared as the clown known as Jester who soon met with Dante and began to provoke him though his taunts were mingled with advice to help hm overcoime the Temen-ni gru, which he eventually succeeded. Eventually, Dante managed to find the way to the tower after Vergil defeated him, Arkham told him that he already got half the amulet he neede, the two then found the way to the final door into which Arkham had unlocked shortly after Vergil reveals who never trusted Arkham and already knew that he would betray him and kill him.

After defeating Beowulf and acquiring the Haywire-Generator, Dante soon realized that he felt weaker, Jester later appeared so he could mock Dante again, after threating him, Jester informs Dante that the Temen-ni-gru is in fact a Human World and Demon World portal, he also explains that he is planning use the amulets to open the portal, which was in the basement of the tower, and Jester also explains to Dante that the Neo-Generator in his hand and the key to move forward, he warns that he will drain the souls of those who hold him in the excharge of power, after that Jester begins to laugh loudry mockingly and leaves the room.

Later, Dante, Vergil and Lady begin to fight within the Sacrificial Chamber, Arkham soon appears before all of them, as his alter-ego, Jester and begins to reveal their manipulators, while he stands between Jester and Arkham, he soon told Vergil that the motive for the ritual had not worked and that it was incomplete and pecunized of a blood of a mortal priesthood, since Sparda would sacrifice himself to seal Temen-ni-gru, and the blood flowing in Lady's veins was the necessary. Arkham soon completes the ritual, plus Vergil, Dante and Lady have literally cornered him. However, since the tower had been opened in a column and the trio began to rise and use it as an advantage. Arkham knocked them down, while the three climbed to the top of the Temen-ni-gru, Arkham reached the tower and gave the seals his names again and soon ascended to the World Demon, he then finds the ancient swold of Sparda who is the Forge Edge and soon claimed his power for him becoming very powerful.