Epithet

An epithet is a name to describe a person or object. It can also be interpreted as a nickname or a title granted to a person. Sometimes, a codename may also fall into this category.

Epithet in One Piece
In One Piece, there are plenty of people with epithets. Plenty of famous characters are known by these nicknames, especially pirates. Usually these titles are granted to pirates by the World Government when they are assigned bounties, to make them more well known to the world, but there are exceptions that the pirate has already chosen a nickname for himself prior to being marked down for being wanted.

Aside from pirates, there are also others who gain epithets, such as other types of criminals, Marine officers, or other significant figures.

Usually, these assigned epithets are based on the description of the person's attributes, skills, or what they simply are.

Straw Hat Pirates

 * Monkey D. Luffy: "Straw Hat" (麦わらのルフィ)
 * Roronoa Zoro: "Pirate Hunter" (海賊狩り)
 * Nami: "Cat Burglar" (泥棒猫)
 * Usopp:
 * "Sogeking" (more like an alias and a split personality, this is his recorded name on the wanted poster)
 * "King of the Snipers" (狙撃の王様)
 * Sanji: "Black Leg" (黒脚)
 * Tony Tony Chopper: "Cotton Candy Lover" (わたあめ大好き)
 * Nico Robin:
 * "Miss All Sunday" (ミス・オールサンデー)
 * "Devil Child" (悪魔の子)
 * Cutty Flam:
 * "Franky" (フランキー)
 * "Cyborg" (鉄人)
 * Brook: "Humming Swordsman" (for his singing while striking with his sword)

Shichibukai
Note: Crocodile and Marshall D. Teach is part of this list.
 * Juracule Mihawk: "Hawk Eyes" (鷹の目のミホーク)
 * Bartholomew Kuma:
 * "Tyrant" (for his vicious tyranny of crushing everything in front of him)
 * "Pacifista" (パシフィスタ)
 * Boa Hancock:
 * "Pirate Empress" (海賊　女帝)
 * "Snake Princess" (蛇姫)
 * Jinbei: "Knight of the Sea" (海侠)

Blackbeard Pirates

 * Marshall D. Teach: "Blackbeard" (黒ひげ)
 * Van Auger: "The Supersonic" (音越)
 * Jesus Burgess: "The Champion" (チャンピオン)
 * Doc Q: "Grim Reaper" (死神)

Yonkou and Crewmates

 * Shanks: "Red-Hair" (赤髪のシャンクス)
 * Rockstar: "Rookie" (for still being a rookie)
 * Edward Newgate: "Whitebeard" (白ひげ)
 * Portgas D. Ace: "Fire Fist" (火拳のエース)

The Eleven Supernovas
Note: both Monkey D. Luffy and Roronoa Zoro are part of this list.
 * Capone Bege: "Gang" (カポネ・“ギャング”ベッジ)
 * Jewelry Bonney: "Big Eater" (大喰らい)
 * Basil Hawkins: "The Magician" (魔術師)
 * Eustass Kid: "Captain" (ユースタス・“キャプテン”キッド)
 * Scratchmen Apoo: "Roar of the Sea" (海鳴り)
 * X. Drake: "Red Flag" (赤旗)
 * Killer: "Massacre Soldier" (殺戮武人)
 * Urouge: "Mad Monk" (怪僧)
 * Trafalgar Law: "Death Surgeon" (死の外科医)

Other Pirates

 * Gol D. Roger: "Pirate King" (海賊王)
 * Alvida: "Iron-Mace" (金棒)
 * Buggy: "The Clown" (道化のバギー)
 * Mohji: "The Beast Tamer" (for his lion taming)
 * Cabaji: "The Acrobat" (for his acrobatic skills)
 * Kuro: "of a Thousand Plans" (百計のクロ)
 * Jango:
 * "One-Two" Jango (for his hypnotic catchphrase)
 * "Double Crosser" (for his defection from the Black Cat Pirates)
 * Zeff: "Red-Leg" (赫足のゼフ)
 * Don Krieg:
 * "Pirate Admiral" (海賊艦隊提督 クリーク)
 * "Foul Play" (for his deceptions)
 * Pearl: "The Iron Wall" (鉄壁のパール)
 * Gin: "Man-Demon" (鬼人のギン)
 * Arlong: "Saw-tooth" (for his saw-like teeth)
 * Yorki: "Calico" (reason unknown)
 * Dorey: "The Blue Ogre" (青鬼のドリー)
 * Burogy: "The Red Ogre" (赤鬼のブロギー)
 * Wapol: "Tin-Plate" (ブリキのワポル)
 * Masira: "Salvage King" (for his salvaging skills)
 * Shoujou: "Sonar King" (for his sonar-like voice)
 * Roshio: "The Executioner" (reason unknown)
 * Bellamy:
 * "The Hyena" (for his scavenging of other pirates' treasure is similar to that of a hyena)
 * "The Big-Time Rookie" (for his so-called big bounty)
 * Sarquiss: "Big Knife" (ビッグナイフ・サーキース)
 * Foxy: "The Silver Fox" (銀ギツネのフォクシー)
 * Pickles: "Tackle Demon" (for his tackling attacks)
 * Absalom:
 * "Graveyard" (墓場のアブサロム)
 * "Ero-salom" (for his perverted personality)
 * Perona: "Ghost Princess" (for her princess-like demeanor and ghost-manipulating powers)
 * Lola: "Marriage Proposal" (for her repeatedly attempts to propose for a marriage)
 * Dias: "Devil" (デビル・ディアス)
 * Silvers Rayleigh: "Dark King" (reason unknown)
 * Fisher Tiger: "The Adventurer" (reason unknown)
 * Kinjishi: "The Flying Pirate" (空飛ぶ海賊 金獅子)
 * San Juan Wolf: "Colossal Battleship" (reason unknown)
 * Basco Shot: "Mighty Drinking" (reason unknown)

Baroque Works
Note: Nico Robin is a part of this list.
 * Crocodile:
 * "Mr. 0" (ミスター・ゼロ)
 * "Sir" (サー・クロコダイル)
 * Daz Bones: "Mr. 1" (ミズター・ワン)
 * Paula: "Miss Doublefinger" (ミス・ダブルフィンガー)
 * Bentham: "Mr. 2 Bon Kurei" (ミスター・ツー ボン・クレー)
 * Galdino: "Mr. 3" (ミズター・スリー)
 * Igaram:
 * "Mr. 8" (ミズター・エイト)
 * "Igarappoi" (イガラッポイ)
 * Nefertari Vivi "Miss Wednesday" (ミス・ウェンズデー)

Sky Island Residents

 * Wiper: "Berserker" (for his blind rage at battle)
 * Gan Fall: "Sky Knight" (for his knighthood in the Sky Island)
 * Calgara: "Demon Warrior" (for his berserk skills)

God's Warriors

 * Eneru: "God" (神)
 * Ohm: "Skybreeder" (スカイブリーダー・オーム)
 * Gedatsu: "Sky Boss" (空番長ゲダツ)
 * Shura: "Skyrider" (スカイライダー・シュラ)
 * Satori: "of the Forest" (森のサトリ)

Marines

 * Morgan: "Axe-Hand" (斧手のモーガン)
 * Fullbody:
 * "Iron Fist" (鉄拳のフルボディ)
 * "Double Iron Fist" (両鉄拳のフルボディ)
 * Smoker: "The White Hunter" (for his smoke abilities)
 * Hina: "The Black Cage" (黒檻のヒナ)
 * Tsuru: "The Great Tactician" (大参謀)
 * Sengoku: "The Buddha" (仏のセンゴク)
 * T-Bone: "Ship Cutter" (船切り)
 * Kuzan: "Blue Pheasant" (青キジ)
 * Sakazuki: "Red Dog" (赤イヌ)
 * Monkey D. Garp:
 * "The Fist" (ゲンコツのガープ)
 * "Hero of the Marines" (for cornering Gol D. Roger on multiple occasions)
 * Attachan: "Flaming" (炎のアタっちゃん)
 * Borsalino: "Yellow Monkey" (黄ザル)

Other Epithets

 * Pell: "Peregrine Falcon" (for his falcon-based Devil Fruit)
 * Chaka: "The Jackal" (for his jackal-based Devil Fruit)
 * Montblanc Norland: "Liar" (for a biased view of his life)
 * Nero: "The Sea Weasel" (海イタチ)
 * Monkey D. Dragon: "Revolutionary" (for his leadership in the Revolutionaries army)
 * Ryuuma: "The King" (for his skills as a swordsman)
 * Oz:
 * "The Devil" (魔人)
 * "The Continent-Puller" (for his immense strength)
 * Jigorou: "of the Wind" (風のジゴロウ)
 * Duval: "Iron Mask" (for the iron mask he wore)
 * Emporio Ivankov:
 * "Miracle Person" (for performing miracles)
 * "Queen" (for his status over Kamabakka Kingdom)
 * Shiryuu: "of the Rain" (雨のシリュウ)

Anime Only

 * Billy: "The Bandit" (for being a bandit)
 * Dick:
 * "Mountain Whale" (reason unknown)
 * "The Bandit" (for being a bandit)
 * Woonan: "Great Gold Pirate" (for his legendary treasure)
 * Galley: "of the Crescent-Moon" (三日月のギャリー)
 * Erik: "The Whirlwind" (旋風のエリック)
 * Bigalo: "The Hanged Man" (reason unknown)
 * Puzzle: "Phoenix" (for his ability to keep standing up to fight)