Naguri is an anime-only character who shows up during the flashback arc exploring Luffy, Ace, and Sabo's childhood. He's a former pirate captain who used to live in the Gray Terminal about twelve years before the main story takes place. Beyond that, not much is known about him—his current whereabouts are a mystery, and it's unclear if he's even still alive.
His main claim to fame in the series is saving the three kids from a massive rampaging bear. It's a memorable moment that fans often note as one of the few times an adult actually helped the young trio out.
First Appearance: Episode 498
Content compiled by AnimeList.moe from publicly available sources.