Nezha

Nezuha (alternative: Nezha) is one of the 10,000 players who were trapped in Sword Art Online, working as a blacksmith. He is the first player to ever open a shop in Aincrad since the Official Server Service.

His shop, «Nezha's Smith Shop», is merely a small street stall consisting of a Vendor's Carpet located on the second floor town of Urbus.

Rondo of the Transient Sword
He is introduced in Rondo of the Transient Sword as a blacksmith with mysteriously poor luck. He shatters Asuna's Wind Fleuret when trying to enhance it.

It's later discovered by Kirito that he steals the weapons given to him for enhancement by replacing them for others with less stats when the players get distracted and tells them that he failed, giving the weapons to his friends, allowing them to battle in the front lines despite their low level.