Classification: Former shinigami, Trascendental (higher dimensional spiritual being)
Threat level: Maoh
Physical: At least island level striking via scaling
Destructive capacity: Continent+ (his previous form was by scaling far stronger than country level Kenpachi, current form is even stronger. Implied he could drag down Soul King Palace even while being restricted on his power output, Soul King Palace consists of several city like structures and is basically a planetary distance away (took Ichigo half a day to cross said distance while going at 3 digit mach speeds)
Durability: Continent+ (should be comparable to his power output), immortality makes him extremely hard to take out
Speed: Currently stationary since hes restrained, but should be at least massively hypersonic+ (4 digits) via scaling
Intelligence: Super genius. Only being acknowledged as clearly superior in intellect to him in the verse is Kisuke Urahara. Fooled Soul Society for over 100 years while running his plan behind the scenes, effectively manipulated a good deal of Ichigo's life, has several inventions to his name. Effectively a battle genius, one of the most skilled fighters in the series with great analytical skills which he makes use of in combat usually with mental warfare.
Stamina: High. Should be one of the highest in the series, effectively being able to keep fighting with serious injuries like slashes across his thorso.
Standard equipment: Zanpakuto (current form doesnt have it anymore apparently), Hogyoku (infused into his being ever since he turned into a true trascendental being)