Different types of sealed Zanpakuto

* Katana (刀): The term katana may be applied to the standard-size, moderately-curved, Japanese sword with a blade length of greater than 60 cm (23.6 inches). The katana is characterized by its distinctive appearance: a curved, slender, single-edged blade, a circular or squared guard, and a grip long enough to accommodate two hands.


* Wakizashi (脇差 (わきざし); meaning "side insertion"): A short blade between 30 and 60 cm (12 and 24 inches), with an average of 50 cm (20 inches). It is similar to but shorter than a katana, and usually shorter than the kodachi (小太刀 (こだち); meaning "small sword"). The wakizashi was usually worn together with the katana. When worn together the pair of swords were called daishō, which translates literally as "large and small". The katana was often called the long sword and the wakizashi the companion sword.


* Nodachi (野太刀 (のだち); meaning "field sword"): The nodachi was more difficult to wield due to its size and weight. The length of the nodachi's hilt varied between twelve to thirteen inches (30 to 33 centimeters). Its cutting capability and range exceeds that of a katana, due to its weight and size.


Shikai information

The Shikai (始解, Initial Release) is the second form (or first "upgraded" form) available to a Zanpakutō. To activate it, the Shinigami needs to learn the name of their Zanpakutō. This is not as easy as simply picking a name, as the living spirit of the Zanpakutō already has its own name. Therefore, the Shinigami must be able to communicate and harmonize with their Zanpakutō effectively, which requires being able to speak to the spirit within its world.

A Zanpakutō can change size and shape depending on the spiritual strength of the owner.

Achievement of the Shikai is a mark of control of a Zanpakutō, and it appears to be a requirement for advancement within the Shinigami ranks, as presumably most seated officers are capable of Shikai. It is also required in order to achieve the rank of lieutenant; as it is a requirement most captains look for. After first learning the Zanpakutō's name, the Shikai can be performed at will simply by speaking a command followed by the Zanpakutō's name. The commands vary between users and range from a simple imperative verb to a short poem. They often relate to the Zanpakutō's signature ability, or hint at the nature of its spirit. This step may be bypassed by expert Shinigami who have learned how to use their Bankai

Dual-Blade Type: Zanpakutō that feature more than one blade in Shikai release. It is decidedly rare for one to possess such a weapon and therefore it says a lot about the uniqueness of its wielder's spiritual power.

Bankai

The Bankai (卍解, Final Release) is the second and final upgraded form of a Zanpakutō. To achieve Bankai, one must be able to materialize and subjugate their Zanpakutō spirit. Materialization means the opposite of getting dragged into the Zanpakutō's inner world, as in the wielders conversations with it. Instead the wielder needs to summon the Zanpakutō's spirit into the physical world. It usually takes 10 years or more to achieve, plus the experience needed to master it.[27]

The power and forms of Shikai and Bankai are dependent on the Zanpakutō. They also vary according to the wielder's strength and training. But in general, one's power can grow 5 to 10 times greater.[28] Only the strongest Shinigami can use it. It is the ultimate technique of a Zanpakutō. Even the Four noble families, whose members are always exceptionally talented, have only a member capable of Bankai every few generations. Those who achieve Bankai always have remarkable roles in the history of Soul Society