Naguri

Naguri is a former pirate captain that lived in the Gray Terminal twelve years before the current storyline. It is unknown where he is, or even whether he is still alive right now.

He appears during the childhood of Luffy, Ace and Sabo and saves them from a large rampaging bear.

Abilities and Powers
Naguri possess Haoshoku Haki as he was able to just stare at a bear to stop her. As a captain he had great skills.

History
In his days as a pirate captain, his crew fought against Gol D. Roger's crew and was easily defeated. After that, his crew suffered a major hit and eventually disbanded.

Many years later he would settle in the Gray Terminal where he is known as an old man who, according to Sabo, invents "weird stuff" out of the junk he collects.

Later, on an expedition the trio performs, they fight with a large bear whom they are unable to defeat. However, Naguri is capable of defeating it easily and forcing its retreat. The trio and Naguri then begin to eat the fish they wanted to use to lure the Giant Tiger, and is surprised to know Ace is Gold Roger's son.

Trivia

 * "Naguri" is one of the words which mean "hammer" in Japanese,