Birthday: June 29th. 176cm. Lieutenant of the 12th Division of the Gotei 13. He is a leading figure in the Department of Research and Development and serves as Mayuri Kurotsuchi's right-hand man. He has a chic personality and a unique appearance befitting a member of the R&D department, with scratch marks running from his left forehead to the back of his head and three horns on his forehead (he's actually quite handsome). Since the Captain and Bureau Director Mayuri is a mad scientist psycho obsessed with research—specifically 'material collection'—Akon appears to handle the actual management and command of the division. He is quite friendly with Soul Reapers from other divisions. Among the many eccentrics in the 12th Division, he is a remarkably normal person. Like Nemu, he is frequently exploited by Mayuri.

17 years old. 173cm. Birthday: March 27th. He has long yellow bangs covering one eye, is friends with Renji, and fanatically admires Rose and Gin. His specialty is cat's cradle. Born into a lower-class noble family in the Soul Society, he was classmates with Abarai Renji, Hinamori Momo, and Kuchiki Rukia at the Shin'o Academy, where he graduated at the top of his class. He has a rigid personality with almost no emotional fluctuations except regarding Ichimaru Gin; even when Aizen was fatally wounded, he maintained his usual lukewarm expression. Conversely, he has absolute trust in his superior, Ichimaru Gin, and follows him while suppressing all his own emotions. He is actually a very versatile character. Beyond graduating top of his class, his Kido abilities are excellent—he can cast level 70 Kido without incantation—and as a former member of the 4th Division, he possesses healing skills. He also has enough close-combat prowess to utilize his Zanpakuto's abilities. Nickname: Yandere. Likes: Agar jelly. Dislikes: Dried persimmons.

Birthday: August 31st. 180cm. Lieutenant of the 6th Division of the Gotei 13. He has long red hair, brown eyes, and a cool, breezy personality. Classmates with Kira and Hisagi. He has tattoos on his forehead and a radical style. He feels sorry for Akon and Nemu. He hates and even loathes the 12th Division Captain, Mayuri Kurotsuchi. To his classmates and friends, he is a sweet man who is warmer and more considerate than anyone else.

17 years old. Lieutenant of the 11th Division of the Gotei 13. Bald, a battle maniac, and a lover of alcohol. He is serious about fighting. Despite his delinquent attitude and sharp, somewhat intimidating appearance, he is a sensible person with a decent personality rarely seen in the Gotei 13. He is deeply considerate and has a delicate side. He is said to be good with his hands. As a side note, although he is bald, he absolutely hates being called bald. When he enters a fight prepared to kill or be killed, he holds the conviction that even if he dies, he will die fighting fairly.

In his 20s. 181cm. He has black hair with bangs falling slightly over his left eye and sideburns that are a bit long along his jawline. He prefers sleeveless clothes and basically wears them even in winter. His personality is caring, diligent, and sincere, but he also has a perverted side that enjoys lewd delusions. He has a '69' tattoo on his left cheek (he says he got it because he was enamored with his Captain). On the right side of his face, he has three scars running from his forehead to his chin (he says they are from a Hollow). His hobby is music, and he enjoys playing the guitar and singing (his skill level is zero). His specialty is cooking. He usually works for the Seireitei Communication. He is treated somewhat roughly; if he passes out drunk at a gathering, people around him just leave him there, assuming someone else will take him home. He almost cried when his Captain, Kensei Muguruma, told him, "You don't have any friends, do you?" (He actually cried when his junior, Kira Izuru, sent him a thoughtful message on Line). He deeply trusts and admires Kensei Muguruma, who is frequently mentioned. Although he is handled roughly or lightly dissed by the superiors he likes, it's clear that he is very much adored and loved within the 9th Division.

167cm, 52kg. Birthday: March 30th. Because she has undergone continuous modification by her creator, Mayuri, she has a strong immunity to artificial poisons and possesses a unique constitution where her joints can bend freely like a ball-jointed doll. Her hobby is experimentation, same as Mayuri. She prefers grilled pike and avoids onions. In the story, she is treated as Mayuri's experimental tool, combat bait, or shield, showing her suffering through constant physical damage and reassembly. She has secretly cursed Mayuri before.

Birthday: June 22nd. 185cm, 67kg. Espada No. 8 of the Arrancar army. Aspect of Death: Madness. Hole location: Glans penis. Szayelaporro Granz defines himself as Hueco Mundo's greatest scientist and a perfect being. His actions are consistent with a sadistic attitude, thoroughly instrumentalizing his creations and treating the lives of others as experimental resources. He has pink short hair, purple glasses, and is incredibly handsome. He hates Mayuri Kurotsuchi and is interested in Akon and Nemu. He's a bit of a pervert.