Well seeing as how Katana and Wakizashi are supposed to be used together (this was how Samurais wielded them??) You could make a pair of swords that were amazing when wielded together...
However on second thought this would be amazingly specific i.e the character using these would have to be proficient in Katanas, Wakizashi/Ninja-to and two weapong style...
Just a thought tho
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