Bogard

Bogart is a Marine Headquarters Marine and the right hand man of Vice Admiral Monkey D. Garp. He was instrumental in training Coby and Helmeppo. He seems to be very good at using a sword, as he was able to cut up Coby's guns without hurting him, and later was training them using only one hand to defend himself.

He was also seen with Vice Admiral Garp in Water 7.

Anime and Manga Differences
His name was revealed in episode 68 credits and never mentioned in the manga.

Trivia

 * He resembles the actor Humphrey Bogart, most notably in Casablanca in terms of appearance and name.