Kitetsu

Kitetsu is a sword-smith who has crafted the Kitetsu sword series. He has yet to make an appearance in the series, but he has been mentioned in Chapter 97 and Episode 49.

Known Work
Each of his blades, which are all named after himself, are cursed, and brings tragedy to whomever wields them. Roronoa Zoro, who wields the Sandai Kitetsu, seems to be an exception, as his luck has surpassed the curse. With each new sword, the classification lowers, seemingly decreasing in quality and strength.
 * Shodai Kitetsu (Saijō Ō Wazamono Grade Swords)
 * Nidai Kitetsu (Ō Wazamono Grade Swords)
 * Sandai Kitetsu (Wazamono Grade Swords)