|Japanese name:||ギルバート ナイトレイ|
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.
Spoiler!Gil was Jack's servant 100 years ago, but he was killed by Glen along with Jack, in order to save him, his brother Vincent opened a path to the Abyss. (It is later revealed that Gil was killed in order to serve as Glen's new vessel, and when Vincent interrupted the ceremony the Tragedy occurred.) He was taken in as a servant by the current Vessalius family fifteen years ago, after he was discovered injured and amnesiac in the Vessalius gardens. He came to be Oz's closest friend, and was invited to be a part of the boy's coming-of-age ceremony. During the ceremony, Zwei uses her chain Doldum to control his body and forces him to attack Oz. After he regains consciousness, he recognizes one of the Baskervilles as Oz's father and when Oz attacks the man with a sword, Gilbert takes the wound and falls unconsciously.
Gil remains loyal to Oz during his time in the Abyss. Shortly after the ceremony, he is approached by Xerxes Break who arranges his adoption into the Nightray family in exchange for inside information on the family's doings. He views this as a betrayal, since the Nightrays are the prime suspects in the assassination of Oz's mother, but he agrees to join the family when he learns that contracting their chain 'Raven' might give him the power to rescue Oz. He trains in gunmanship and eventually kills the Nightray family before the chain deems him worthy to contract with it.
Once he obtains the chain, he takes the name Raven and goes to work for Break as a member of Pandora. When Oz returns from the Abyss, Gil is the first one at his side. Initially, Oz is unaware that 'Raven' is Gil, but during the second battle with Zwei his true identity is revealed. Gilbert uses his chain's power to bind B-Rabbit, keeping Alice in her human form and preventing Oz's seal from moving when they are not in battle.
Voiced by: Azuma Sakamoto (younger) and Toriumi Kousuke (older)