—Tsunenaga Tamaki, to Makina
|Also Known As|| Promoter Tamaki|
|Manga debut||Chapter 1|
|Anime debut||Episode 1|
Tamaki has a fox or weasel-like appearance, being fairly slim and skinny. He has a narrow face on which is almost always a smile. His hair is dark grey and combed backwards, although there is always one strand of hair that is standing upwards. His hair is a little longer on his neck.
He always wears a grey suit with a white, formal shirt, accompanied by a blue tie. He also wears glasses.
He initially appeared as a kind and caring man. However, this was just a disguise to hide his true nature. Under his calm, almost idiotic attitude, he is something of a sadist, caring nothing about the fact that he butchers dozens of prisoners every day for the sole purpose of gathering money or experimenting on them, or simply, and mainly, for his own twisted amusement. In sharp contrast with his cruelty, he enjoys playing with children's toys. He rarely gets angry even when things don't go his way. He has demonstrated an ambitious and power-hungry side. He doesn't like to lose. He eagerly hoped for the death of the director in order to truly become the supreme ruler of the prison, and he devotes much of his time and resources in studying and experimenting on the powers of the Branch of Sin and its origin. However, his mind finally snapped when he found out that it was Hagire Rinichirō who was really controlling him the entire time.
Before the Great Tokyo earthquake incident Tamaki was a reclusive and indifferent computer otaku who spent hours if not days secluded in his room, playing games, not caring anything even about his own family. On the day of the earthquake, his computers and game consoles were destroyed. The power was down, so he searched for the back-up generator. In his path, however, lay his mother, who cried for help. Tamaki, who was hurried to keep playing, ignored her and left her to die. When the generator was running, Tamaki realizes that his games were broken. This sent him over the edge of sanity and led him to engineer Deadman Wonderland as a gigantic game, so as to keep playing as he did before the earthquake.
He first appears as a lawyer, "defending" Ganta Igarashi. He is the one who presented false evidence to the court, in order to get Ganta to Deadman Wonderland.
The next time Tamaki is seen, he is the promoter of DW. He talks to Makina about her attacking Yō Takami. He says that she didn't even explain the death sentence rule. Makina says it has no point in telling him and he quotes that Ganta will die in an accident at the construction site. She asks why it must happen so soon and Tamaki explains that he is the impatient type.
It is later revealed that his sick game was really just part of his plan to kill the Wretched Egg; however, he failed when his Forgeries were defeated. He was horrified when he saw Wretched Egg defeated the Forgeries easily after having information about Wretched Egg. Nevertheless, when confronted by Hagire Rinichirō (in Toto Sakigami'ss body), who revealed himself to be the real director of Deadman Wonderland, Hagire had anticipated that Tamaki would tried to use the information on Wretched Egg to defeat her so Hagire made sure that Tamaki got false information on Wretched Egg so the Forgeries can't kill her. Hagire made aware that Tamaki was no more than another pawn in Hagire's own game, Tamaki shot himself in the head as an ultimate assurance (mostly delusional) that this was his, and only his, game despite the fact that this is really Hagire's game.
- He's the second character in the series that has committed suicide.
- His default expression, smiling widely with closed eyes, is known as "Kitsune no me" (Fox Eyes). This expression is used in Japanese media for characters that are tricksters.