Duke was the King
of Southtown and the leader of the Mephistopheles gang, a sub-syndicate
of the underworld organization Addes. He answers to Jivatma,
who he used to work for before he became Mephistopheles' leader. Jivatma
refers to him as Type "D" (although he hates this name) and his underling,
as Type "N." Currently, Duke is seen as a traitor to Addes, although he
is a member of The Children of Kokaviel (a group of Addes' top authorities).
He is connected to Lien Neville
in that he is responsible for her parents' death but spared her life. Duke
is also responsible for the death of Fate, Alba
and Soiree's mentor, but not directly
by his own hand.
Duke enters the next
tournament to "redeem" himself after being defeated by Alba, and therefore,
losing his position as the King of Southtown. He apparently underwent a
surgical modification early on after his parents vanished. He underwent
the surgery so that Addes would cure his sister, who died for an unknown
reason. The fact that she died greatly bothers Duke and he often starts
the statement "It is an old story...20 years ago."