Oto and Kogarashi

Outou and Kogarashi are a pair of double-edged swords wielded by Shiki. Though it is unknown what special properties they have, he notes them to be famous. In the past, Shiki wielded them as regular swords, but eighteen years ago, after severing his legs to escape Impel Down, he grafted both Outou and Kogarashi onto where his missing feet were. They have since become his prosthetic legs, with Outou being the left, while Kogarashi being the right.

Abilities
Shiki has been shown to wield both of his swords with great skill. He was powerful enough to kill a massive amount of soldiers in Marineford, as well as challenge famous characters like Gol D. Roger, Monkey D. Garp, and Sengoku with them.

After the two swords became his new legs, he has shown to be able to send out air-based slashes by kicking with them, similar to the CP9 members' Rankyaku technique. Combined with his Fuwa Fuwa no Mi, which allows him to levitate non-organic objects, Shiki gains the ability to fly and easily evade attacks by lifting the swords into the air.

Translation and Dub issues
"Outou" literally translates to "Ten Cherry Blossom", while "Kogarashi" means "Cold Wintry Wind".