Raikū

Sealed, Raikū disguises itself as a silver cane, its dark blue handle sweeping around to join the shaft. At the command Go Mad, a yellow-green light coils over the cane and reshapes it into a double-headed voulge streaked with red markings.

The weapon is defined by its dominion over space, and it announces that power with a bell-like chime each time Inaba spins it. That same authority reaches beyond the duel, since Raikū governs the Reiatsu-limiter bracelets worn by Inaba's Reigai, letting him snap them open and send those duplicates surging to full strength.

Spinning the blade lets Inaba tear open portals that link to the Dangai, which can drag an opponent inside. A rightward twirl swallows an incoming attack and records it, capturing not only strikes but movements and even an enemy Zanpakutō's traits, while a leftward twirl calls up a portal that replays whatever he stored, as many times as he likes. He can record himself to spawn an independent clone, or fold the portals onto his own body to blink instantly to a new spot. The power carries limits, though. Inaba must finish the rotation to copy or recreate space, so blocking the spin on either side denies that half of the ability, only one direction works at a time, constant use bleeds his energy, and any clone he makes carries no weapon of its own. He turned all of this against the Gotei 13 during the Reigai's invasion, a storyline told only in the anime.