Sniper

A Marksman (also called Sniper) is a person adept at utilizing as well as maintaining range weaponry.

Marksmen in One Piece
Much like musicians, Marksman, in the One Piece World are an optional and alternative occupation in any marine or pirating crew. Due to their choice of weaponry, Marksman excel best at long-range combat. Weapons that most snipers prefer to utilize include the rifle or even a pistol (for close-range), but can also include weapons of artillery such as cannons and mortars and highly customized weapons that best suits the Marksman skill.

Known Marksmen

 * Usopp (Straw Hat Pirates): Slingshot and Kabuto (supported with hammers, dials, tricks and lies)
 * Franky (Straw Hat Pirates): Ouch Finger, Weapons Left, Hakugeki Hou, Coup de Vent, etc.
 * Yasopp (Red-Haired Pirates): Handguns, rifles/muskets
 * Don Krieg (Don Krieg's Pirate Armada): Guns, flamethrower, needles machine gun and other weapons
 * Rivers (Bellamy Pirates)
 * Van Augur (Blackbeard Pirates): Senriku
 * Chew (Incarcerated; Arlong Pirates): Mizudeppou
 * Chess (Formerly Chief-of-Staff of Drum Kingdom): Wapol Pirates): Huge flaming arrows
 * Igaram (Arabasta Kingdom/Baroque Works): Hidden guns
 * Mr. 9 (Baroque Works): Bazooka
 * Nefertari Vivi (Arabasta Kingdom/Baroque Works): Bazooka
 * Mr. 5 (Baroque Works): Flintlock .44 caliber 6 shot revolver, supported with the Bomu Bomu no Mi
 * Mr. 4 (Baroque Works): Lassou, bazooka, 4-ton bat and explosive balls
 * Mr. 7 (Baroque Works): Yellow Gun
 * Miss Father's Day (Baroque Works): Gero Gun
 * Wiper (Shandian Warriors): Burn Bazooka
 * Braham (Shandian Warriors): Flash Guns
 * Genbou (Shandian Warriors): Bazooka
 * Laki (Shandian Warriors): Rifle
 * Tilestone (Galley-La Company): Cannons
 * Peepley Lulu (Galley-La Company): Pair of guns
 * Zambai (Franky Family): Bazooka
 * CP9 members (World Government): Shigan, Rankyaku, and variations of both
 * Absalom (Thriller Bark): Pair of bazookas
 * Bartholomew Kuma (Shichibukai): Laser beams
 * Pacifista (Marines): Laser beams
 * Duval: (Rosy Life Riders): Harpoon guns
 * World Nobles: Pistols, rifles
 * Kizaru (Marines): Laser beams
 * Capone Bege (Firetank Pirates): Unknown Devil Fruit allows miniature crew to use cannons from inside his body via ports
 * Kuja: Snake Weapon in form of a bow
 * Heracles: High-speed lances.
 * Curiel (Whitebeard Pirates): Guns and cannons
 * Izou (Whitebeard Pirates): Flintlock pistols

Anime Only

 * Daddy Masterson (Formerly Marines, bounty hunter): Arsenal of handguns
 * Corto (Amigo Pirates): Machine gun, exploding maracas and cannons belt