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He is able to weaponize this by attacking their bodies from within, though if the fusee is able to resist the process it causes damage to him. Its ultimate ability - Seitai Yūgō - lets him fuse with other living beings like Soul Reapers and Hollows.
By merging with objects like Gigai he can turn them into extensions of himself that he can control.
Fusion Dance: Sōya Azashiro's bankai let him fuse with his surroundings to the extent that his Inner World merged with the outer world, effectively making him invulnerable to everything except power absorption techniques. His efforts to procure an army to do so led to him being branded a traitor and imprisoned in Muken. Final Solution: He advocated carrying out a genocide against the Hollows of Hueco Mundo. When his family was framed for a crime and sentenced to trial-by-combat against a Hollow, Azashiro's sister sacrificed herself to kill it and save him. Even Evil Has Loved Ones: The only person he cared about was his older sister, who convinced him to become a Soul Reaper and join the Thirteen Court Guard Squads. His unnamed shikai, however, has no special abilities whatsoever and is no more powerful than an Asauchi. Cool Sword: His Zanpakuto's bankai state effectively makes him invincible despite his frail physique. Big Bad Ensemble: He shares the villain spotlight with Cien Granz, seeking revenge against Soul Society for stopping his genocide against Hueco Mundo and imprisoning him in Muken. After the death of his beloved sister, Sōya sought to kill all the nobles in Soul Society but came to the realization that Vengeance Feels Empty. Aristocrats Are Evil: Sōya came from the Azashiro Clan, a family of corrupt aristocrats who had been conspired against by their political rivals and sentenced to death via trial by combat against Hollows. Instead of being used as a means of torture, Azashiro uses the time to connect to and bond with his zanpakuto, Urozakuro, during his imprisonment. After bringing himself back to Muken of his own volition, he administers to himself the same perceptional drug that had been administered to Szayelaporro that made hundreds of years pass by in a single second. The eighth Kenpachi of the 11th Division. Power Incontinence: He had to be careful when unleashing his bankai, since it wouldn't distinguish between friend and foe, and was forbidden from releasing it inside the Seireitei. Posthumous Character: He was effortlessly killed by his successor, Soya Azashiro, who fused with him and killed him from the inside. Only Six Faces: Strongly resembles Ginjo, but with Zaraki's Post-Timeskip hairstyle. Its shikai - Gagaku Kairō - summons thirteen floating white blobs with enormous sets of toothy jaws while its bankai - also called Gagaku Kairō - summons a massive set of jaws that devours everything in its vicinity. Guardian Entity: His Zanpakuto, Kamawariro, was like Unohana's in that it manifested living entities when it was released.
Eating the Enemy: His shikai and bankai - both called Gagaku Kairō - summon large floating jaws that devour everything within their reach.Drill Sergeant Nasty: He organized the unruly warriors of Squad Eleven into a formidable army - something that was eventually undone by Kenpachi Kiganjō.Declining Promotion: He was invited to join Squad Zero, but refused due to not wanting to spend his time hiding in a pocket dimension.Cooldown: If he uses his bankai, he is left unable to use his Zanpakuto's abilities for six months.Outside of battle, however, he was noted to be a fairly relaxed and social person, enjoying drinking and partying with Shunsui Kyōraku. Blood Knight: As befitting a Kenpachi, he desired to face only the strongest of opponents - completely ignoring weaker ones, which he admitted was a tendency that might someday get him killed.The seventh Kenpachi of the 11th Division. Zanpakutou: Gagaku Kairō (Shikai) / Gagaku Kairō (Bankai)