Classification: Shinigami, Gotei 13 captain (11th division)
Threat level: Maoh-
Physical strength: Country level striking
Durability: At least country+ (one of the biggest tanks in the series capable of taking great damage scaling only under the verses God tiers in this regard, took the backlash from destroying Gremmy's meteor at point blank unharmed and tanked nearly all of Gremmy's assaults including his multiple Gremmy kamikazes)
Speed: Massively Hypersonic (Although he doesn't posses shunpo he does posses great combat speed which can keep up even with the series top tiers. Was easily outpacing Gremmy in combat and outspeed the speed of Gremmy's meteor during his jump to destroy it.)
Intelligence: Below average. Although not particularly bright hes not exactly dumb either, he usually simply doesn't care about anything except fighting which usually leads him to hasty decisions. However he is a natural prodigy at combat which was noted as being far above the original and previously strongest Kenpachi, Retsu Unohana and potentially an threat to the entire Gotei 13 even when Yamamoto was alive (this before his shikai was even known). Has a great deal of experience in combat.
Stamina: Extremely high. Can continue fighting with injuries that would kill a normal person. Literally has laughed off being pierced through his stomach.
Standard equipment: His zanpakuto which at first sight appears to be simply a worn out extra long Katana (Nozarashi)