[quote=@Jasonhero]
A Katana Sword and Sheath stolen from a novelty Shop. He sharpened the blade. [/quote]

It it is not a problem that your character knows how to use a sword, but would sharpening a novelty "for show" katana just be a waste of time? The cheap stainless steel making up the blade is produced to retain the shine and prevent rust; they do not hold edge well and would probably shatter on impact after a strong swing. To me it would make more sense for your character to find a vintage real katana in an abandoned thrift shop and fix that up. 
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Here's hoping that more people post their character sheets.