Kazenbo

Kazenbo is a flaming ghost-like entity created by Kurozumi Kanjuro, with the power of the Fude Fude no Mi, for the purpose of destroying Onigashima. It was created to symbolize the "burning hatred" of the Kurozumi Family against those who wronged them.

Appearance
Kazenbo is a massive ethereal being, having the ability to fluctuate in size to the point of taking up the entire height and width of large corridors. It starts out transparent at the bottom, but becomes much darker and more opaque towards the top, where it possesses two glowing eyes. Large flames burn along its edges.

Personality
Kazenbo is the manifestation of the hatred of the Kurozumi Family, particularly the entity's creator Kanjuro. While it started out doing nothing other than going to the location that Kanjuro intended for it, it does appear as though Kazenbo has a consciousness and personality of its own, as shown by its response to Yamato's attacks. It is shown to have high reverence for Orochi, referring to him as "Orochi-sama".

Abilities and Powers
Being covered in flames, Kazenbo is capable of burning anything it comes into contact with. Due to its large size, it is very difficult to avoid and thus is capable of causing tremendous destruction in a short timespan. It is intangible and capable of passing through any solid object, particularly walls and floors. It appears that Kazenbo can manipulate its shape at will, allowing it to generate appendages to aid in close combat.

Being made of flames, it does appear as though Kazenbo is vulnerable to ice attacks, as shown when it recoiled against Yamato's strike.

Wano Country Arc
As Kurozumi Kanjuro laid dying on Onigashima, his relative Kurozumi Orochi contacted him to give one last "encore" in the Kurozumi Family's story by creating a manifestation of their burning, unending hatred. Kanjuro thus drew and manifested Kazenbo with the power of the Fude Fude no Mi, and the entity was tasked with going to the Armory at the bottom of Kaidou's fortress which would destroy all of Onigashima. Kazenbo moved freely through the fortress, setting fire to everything it touched and causing much of the structure to burn as a result.

Kazenbo made it to the Armory unopposed, but Yamato was able to get there at the same time and use her Mythical Zoan abilities to freeze the explosives, preventing Kazenbo from detonating them. Yamato then struck Kazenbo with an ice-powered kanabo attack, making it groan; Kazenbo then called out to Orochi as it manifested an arm-like appendage and hit Yamato with it.

Trivia

 * In Japanese mythology, the Kazenbo is a yokai in the form of a monk engulfed in flames.
 * "Kazenbo" means "monk before the fire" in Japanese.
 * The appearance of Kazenbo is rather similar to that of the representation of Kanjuro during Orochi's flashback when he was offered to eat his Devil Fruit.