Also known as Gil or Raven. He is Oz's best friend and loyal servant. Oz is his most important person, for whom he is willing to sacrifice anything; this protectiveness is compounded by the fact that he was brainwashed by Miranda Barma to protect Jack Vessalius (and therefore Oz, who is his medium) even if it means killing. When Gil is drunk, he reverts to his fourteen-year-old self, an insecure crybaby. He cares deeply about the hat that Ada gave him. He is a great cook, terrified of cats, unable to quit smoking in eight attempts, and constantly afraid that as Oz grows, he will be left behind.

Heat is a crime story featuring a young man named Tatsumi Karasawa who suddenly rises in the criminal world of Shinjuku, Tokyo, and becomes the leader of a group of amateurs who show no reluctance to face police and gangs alike. His successes in the Tokyo underground make a chief and a yakuza boss plot a conspiracy to eliminate him.

Madara Uchiha was the leader of the Uchiha clan prior to and after the formation of Konohagakure. After allying with his rival, Hashirama Senju, he also helped to found Konohagakure. Madara is considered by many notable individuals to be one of the most gifted shinobi in history and the most powerful that has ever been produced within the Uchiha clan.
He appeared when revived by the Impure World Resurrection.

Apparently an easygoing, reckless and somehow comical high-school student known only due to his incapability to arrive on time for classes, he is in fact the result of an experiment made years before by a powerful crime syndicate lord.
The man, dying of old age, tried to use medical knowledge and advanced technology to revive himself as a youth, and thus create a cloning facility where he experimented with cloning humans and transferring memories and experience from a mind to another, so as to be reborn as an ultimate being. His plans failed however, as he died before his project could be brought into fruition, and thus the numerous Shou clones where all scattered far and wide in Japan, each of them focusing on a single area of expertise (be it stunt-driving, surgery, military training, and so on), until two of them encountered each other by chance, thus prompting all clones to reunite and, thanks to the shared experience of them all, vow to redeem Japan and destroy what they perceived as evil, in a similar way of a terror group.