Kashu is a katana that sits within the fifty Skillful Grade blades. Mr. 11, an operative of Baroque Works, carried it first, then it passed to the Marine officer Tashigi after she bested him in a duel and took the sword as her own.
Kashu carries a name of its own and belongs to the Skillful Grade set, the fifty blades that form the entry rung of the famous-blade tiers. Mr. 11 of Baroque Works held it before Tashigi of the Marines defeated him and claimed it. Readers see only the naked blade in the manga; the anime later reveals the grip, fitting it with an ordinary round tsuba.
What Kashu is actually capable of stays a blank. The story never puts its edge to any notable test or hints at hidden properties, so all that can be said of the sword's power is its rank as a Skillful Grade blade. Everything else about its performance remains unrecorded.
Mr. 11, an officer of Baroque Works, wielded the katana until Tashigi took it as a prize from their bout. For her, it was the second famous sword recovered from a lawbreaker; earlier she had stripped Yamaoroshi from a pirate known as Billy the Orca Killer. The live-action adaptation gives the moment a comic twist: Mr. 11 knows neither the blade's name nor its grade, and upon hearing it is a renowned sword, he playfully christens it Walter.

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Kashu is used by Tashigi of the Marines, who defeated the Baroque Works agent Mr. 11 in a duel and took the katana from him afterward.
One of Tashigi's swords is named Kashu, a Skillful Grade katana that once belonged to the Baroque Works officer Mr. 11 before she won it in combat.
A Kashu is a named katana ranked among the fifty Skillful Grade swords, the entry-level tier of One Piece's renowned blade rankings, though its exact combat abilities are never demonstrated in the story.
Before claiming Kashu, Tashigi had already taken the sword Yamaoroshi from a pirate known as Billy the Orca Killer, making Kashu the second famous blade she recovered from a lawbreaker.
Yes, in the live-action adaptation Mr. 11 does not know the sword's name or grade, and upon learning it is a renowned blade he playfully names it Walter.
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