BG9

is a Quincy and a member of the Wandenreich's Sternritter with the designation "K".

Appearance
BG9 is a tall individual who wears a helmet that conceals its entire head, as well as its single, glowing eye. At its front, the helmet has a peak at the center with slits on both sides. It wears a white, high collar cloak, under which it hides many extendable, tendril-like appendages. It has a broad upper torso and wears armor plating on its shoulders, upper back and torso, forearms, and hips. The armor also serves as a cover for its weaponry.

Personality
BG9 is ruthless, willing to go to extreme lengths to gain an answer to a question, such as harming the loved ones of the person it is interrogating. It also is not above harming children.

The Thousand-Year Blood War arc
Upon receiving the orders of Yhwach, BG9 and the other Sternritter gather at the Sun Gate before traveling to the Seireitei in order to participate in the conquest of Soul Society. Once there, BG9 is confronted by Captain Suì-Fēng. When she activates her Bankai, BG9 steals it.

Later, BG9 is present at a meeting of the Sternritter where Yhwach announces Uryū Ishida is to be his successor. Afterwards, BG9, Bazz-B, Mask De Masculine, and Cang Du discuss the announcement. When Bazz-B questions Yhwach's decision, BG9 tells him that only Yhwach can explain this.

When the Seireitei is replaced by the Wandenreich Headquarters, BG9 arrives at the family home of Marechiyo Ōmaeda and confronts the lieutenant. It proceeds to question Ōmaeda as to where Suì-Fēng is located but receives no answer, and states it has thoroughly investigated the area but has found no sign of her in or near Seireitei. Irritated by Ōmaeda's persistence, it stabs Mareyo, who is hiding behind a building, and then threatens to kill Ōmaeda's family if he doesn't cooperate. BG9 ruthlessly asks if Ōmaeda will be fine with letting his sister go, and letting her insides pour out. It shrugs off an attack by Ōmaeda and readies its spirit weapon, only for Suì-Fēng to destroy the barrel of the minigun. BG9 states that it is surprised to see her with such an appearance, and explains the details of her Shunkō. Suì-Fēng states she perfected it and thanks BG9 for stealing her Bankai, as if it hadn't, she might not have perfected her Shunkō and deals a powerful blow. As the dust settles, BG9 emerges, eye glowing.

It attempts to blindside Suì-Fēng, but fails. After being questioned how it could still be breathing, BG9 claims that it has never breathed, causing Suì-Fēng to believe it's a robot. BG9 then opens some of the plating on its body to reveal multiple stud like projectiles, which it fires as BG9 expresses its disappointment that it didn't need to use Suì-Fēng's stolen Bankai. Suì-Fēng tries to dodge, but ends up getting grabbed by BG9, who states that it has gathered data on her techniques, and being blasted again at point-blank range.

Equipment
Medallion: BG9 possesses a round, unnamed device which is roughly the size of a person's palm and has the Wandenreich insignia etched into its surface. When activated, the device can steal a currently released Bankai in the immediate vicinity, as evidenced when BG9 used the device to take Suì-Fēng's Jakuhō Raikōben.

Powers & Abilities
Great Spiritual Power: BG9's spiritual power is on a level comparable to or greater than that of a captain-level Shinigami.

Enhanced Durability: BG9 is durable enough to take a direct hit from Ōmaeda's "Gegetsuburi" to the head, and not even react. It also later withstood a devastating blow from Suì-Fēng's Shunkō and remained standing, despite the damage to the surrounding environment.

Tendrils: BG9 possesses several tendrils which can extend a great distance. The tendrils also are able to pierce many different materials, being able to go through stone walls and impale someone a distance away.

Spirit Weapon
Reishi Minigun: Using its abilities as a Quincy, BG9 can concentrate both spirit energy and particles in order to transform them into weapons. Its favored weapon manifests in the form of a large, ten-barreled minigun, emblazoned with the Wandenreich's emblem.

Reishi Missiles: By opening the armor plating covering them, BG9 can reveal several stub like devices. It can fire these devices like missiles, creating a massive explosion. It can fire all rounds simultaneously and quickly reload them.