Kessui

The Kessui is Hannyabal's signature weapon. It is a naginata, a Japanese halberd, with an extra-long spear-blade attached to each end. Each blade is an actual katana, complete with the hilt and guard, effectively making this two katanas linked together into a spear. With two blades and a long reach, the Kessui can be a powerful weapon.

While Hannyabal usually carries a pitchfork during his round of duty, he has never been seen using it (except during the anime, to fend off lesser foes), yet he is not seen holding Kessui around with him until he truly needs it, suggesting that Hannyabal only brings out the double-bladed naginata as his trump card.

Abilities
Hannyabal has show to be very skilled wielding the Kessui, seemingly to save its usage only when he deems it necessary. With a long blade on each end, he has a very long attack range. He could spin it rapidly to create flames from friction to deter his opponents. With his, he formed one named attack, as listed below:
 * Hannya Carnival: Shonetsu Jigoku Guruma (ハンニャカーニバル 焦熱地獄車): Along with fanfare being played by guards alongside him, Hannyabal twirls the sword in such a way that it creates two flaming wheels at his sides. In the Viz Manga, this is called Hannya Carnival!! Inferno Hell Wheel. In the anime this is called Hannya Hustle Dance: Shounetsu Jigoku Guruma. In the FUNimation subs, this is called Hannya Hustle Dance: Inferno Hell Wheel. This was first seen used against Monkey D. Luffy.

Trivia

 * Hannyabal's Hannya Carnival technique resembles fire dancing.