Ensign

"Ensign" (少尉) is a naval rank.

In One Piece, Ensign is the lowest marine officer rank below Lieutenant Junior Grade and above Warrant Officer. This is the lowest rank given permission to wear "Justice" (正義 Seigi) on the backs of their clothing and a relatively unused rank.

List of ensigns in One Piece:
 * Tashigi
 * Makko

Trivia

 * As Makko has only appeared in one panel over the length of the story, it would appear that this is a close contender for least used rank comparable with Commodore, the rank of currently only Tashigi's superior and partner Smoker.