Weapon

"As an Inkling, you can use weapons and ink your turf. Be sure to experiment with different weapon sets!"

- Splatoon official site

Weapons are tools used in Splatoon to spread ink and splatter enemy Inklings. They can be purchased from Ammo Knights with Cash earned from online multiplayer matches. Weapons are always in a predefined set of a Main Weapon, a Sub Weapon, and a Special Weapon. Sub Weapons, or secondary weapons, consume considerably more ink than Main Weapons and usually serve specialized purposes limited to specific combat situations. Special Weapons are powerful weapons that can only be used after filling up the Special Gauge by covering enough ground with ink.

Main
All weapons have a standard version and an alternative branded version with a different Sub Weapon and Special Weapon equipped.

Shooter

 * The Splattershot Jr. is a fast firing weapon with low range and damage. This weapon is the first weapon available.
 * The Custom Splattershot Jr. is identical to the Splattershot Jr. However, it has different sub and special weapons. It also has a star on the side of the gun.
 * The Splattershot has a better range and damage output than the Splattershot Jr., but has a lower fire rate. This is gun may be one of the most versatile, and one of the most iconic, weapons in Splatoon
 * The Tentatek Splattershot is identical to the Splattershot. However, it has different sub and special weapons and a Tentatek logo on the side.
 * The Hero Shot Replica is identical to the Splattershot. However, it looks like the Hero Shot from Octo Valley and is unlocked via the Squid amiibo.
 * The Octoshot Replica is identical to the Tentatek Splattershot. It is unlocked upon reaching level 40 and given from Judd. It looks like the gun the Octolings use.
 * The Splattershot Pro is a slightly slower and stronger version of the Splattershot with more range, but each shot consumes more ink.
 * The Forge Splattershot Pro is identical to the Splattershot Pro. However, it has different sub and special weapons, as well as a Forge logo on the side.
 * The Aerospray MG fires in quick bursts, so players are able to coat large areas in a short amount of time. However, it is a short-range weapon, so it struggles in mid to long range combat.
 * The Aerospray RG is similar to the Aerospray MG, but with different sub and special weapons and a golden colour scheme.
 * The Jet Squelcher has the longest firing range in the Shooter category. It can be a fairly effective sniping tool.
 * The Custom Jet Squelcher is identical to the Jet Squelcher, but with different sub and special weapons. It has the "Custom" Logo on the side.
 * The Dual Squelcher is similar to the Jet Squelcher. However, it has a faster firing rate and lower damage. It also has different sub and special weapons, as well as a red colour scheme.
 * The Custom Dual Squelcher is an already released, free DLC weapon that's identical to the Dual Squelcher. However, it has different sub and special weapons. It too has the "Custom" Logo on the side.
 * The L-3 Nozzlenose is an already released, free DLC weapon that has a large, curved mouth and is wrapped with a fire hose. It is a semi-automatic shooter, which means it fires three shots each time is pressed.
 * The N-ZAP '85 is an already released, free DLC weapon that takes inspiration from the original NES Zapper.
 * The N-ZAP '89 is an already released, free DLC weapon that takes inspiration from the 1989 version of the NES Zapper. Instead of being black and white, it is orange and white.
 * The Splash-o-matic is an already released, free DLC weapon that is a steampunk-style, pistol-like weapon with a high rate of fire.
 * The Neo Splash-o-matic is an already released, free DLC weapon that is identical to the Splash-o-matic but with different sub and special weapons. It also has a logo on the side.
 * The Sploosh-o-matic is an already released, free DLC weapon. It has similar stats with the Splash-o-matic, but is less accurate and has less range in exchange for a higher damage output. It also comes with different sub and special weapons.
 * The .52 Gal is a slower firing Splattershot with more range and power. It is pink and grey.
 * The .52 Gal Deco is identical to the .52 Gal. However, it has different sub and special weapons and it has a bedazzled appearance.
 * The .96 Gal is a stronger version of the .52 Gal. It boasts more range and damage than the .52 Gal, but half the fire rate. It also has different sub and special weapons.
 * The .96 Gal Deco is an already released, free DLC weapon that is identical to the .96 Gal, but with different sub and special weapons.
 * The Blaster shoots large bullets that explode into ink. Enemies can be caught in its blast, but a direct shot will instantly take them out.
 * The Custom Blaster is identical to the Blaster, but with different sub and special weapons. It has the "Custom" Logo on the barrel of the gun.
 * The Rapid Blaster does less damage and doesn't fire as far as the Blaster, but has a faster fire rate.
 * The Rapid Blaster Deco is identical to the rapid blaster, but with different sub and special weapons. It is red and gray, with small, yellow arrows serving as highlights.
 * The Range Blaster is an already released, free DLC weapon that has similar stats with the Blaster, but has a lower firing rate and has a farther range. It also comes with different sub and special weapons.
 * The Luna Blaster is an already released, free DLC blaster that has a very short range and low rate of fire, but does massive damage. Compared to most other guns, it has a sort of futuristic appearance.

Charger

 * The Splat Charger requires a quick charge, but is able to splatter the ground in a linear fashion and take out distant enemies.
 * The Kelp Splat Charger is identical to the Splat Charger, but with different sub and special weapons.
 * The Hero Charger Replica is identical to the Splat Charger. However, it looks like the Hero Charger from the Inkling Girl amiibo Challenges via the Inkling Girl amiibo
 * The Splatterscope is a variant of the Splat Charger. It features a scope, making it easy to take out distant enemies. It has the same sub and special weapons as the Splat Charger.
 * The Kelp Splatterscope is identical to the Splatterscope, but has the same sub and special weapons as those of the Kelp Splat Charger.
 * The E-liter 3K has a fairly time-consuming charge rate, but it is able to shoot enemies from very far away.
 * The Custom E-liter 3K is an already released, free DLC weapon that is identical to the E-liter 3K. It has a different sub and special weapon.
 * The E-liter 3K Scope is an already released, free DLC weapon that appears similar to the E-liter 3K. However, this weapon includes a scope for long-range shots.
 * The Classic Squiffer is a faster firing charger with less range and power. It still shoots enemies in a linear fashion.
 * The New Squiffer is identical to the Classic Squiffer. However, it has different sub and special weapons.

Roller

 * The Splat Roller allows players to spread ink while moving quickly. When shaken, it splatters a small amount of ink nearby.
 * The Krak-On Splat Roller is identical to the Splat Roller, but with different sub and special weapons.
 * The Hero Roller Replica is identical to the Splat Roller. However, it looks like the Hero Roller from the Inkling Boy amiibo Challenges via the Inkling Boy amiibo.
 * The Inkbrush is an already released, free DLC weapon. It covers a small amount of territory and can be swiped quickly as a melee attack, and allows for extremely quick movement.
 * The Inkbrush Nouveau is an already released, free DLC weapon that is identical to the Inkbrush but with different sub and special weapons.
 * The Octobrush is an already released, free DLC weapon. It is similar in both appearance and playstyle to the Inkbrush, but sacrifices speed for damage and ink coverage.
 * The Carbon Roller is an already released, free DLC weapon. It's more agile than the Splat Roller, though it does less damage and doesn't fling ink as far.
 * The Dynamo Roller covers a large amount of turf and deflects enemy fire when shaken, but is fairly slow.
 * The Gold Dynamo Roller is identical to the Dynamo Roller, but with different sub and special weapons and a golden appearance.

Slosher

 * The Slosher is an already released, free DLC weapon. It is a bucket that hurls ink straight ahead with a high range, and it can be used to splat opponents high up, or on the other side of a wall.

Splatling

 * The Heavy Splatling is an already released, free DLC weapon. It is a Gatling-style weapon that can be charged for a powerful attack.

Sub

 * The Burst Bomb is a water balloon-esque bomb that explodes on impact. Because it contains less ink than a Splat Bomb, multiple can be thrown quickly and two must be used in order to splatter an opponent.
 * The Disruptor slows enemies down and lowers their abilities.
 * The Ink Mine can be hidden in ink, and will explode after a short amount of time or when an enemy touches it.
 * The Point Sensor reveals the locations of enemies and marks them for all teammates to see for easy tracking.
 * The Seeker is a mechanical device that follows enemies and leaves a trail of ink behind. Upon reaching its target or after a certain amount of time, it explodes into a large burst of ink.
 * The Splat Bomb is the standard Sub Weapon. It is a pyramidal container filled with ink that explodes after a short period of time.
 * The Splash Wall forms a barrier made of falling ink that prevents enemy movement and fire.
 * The Sprinkler can be thrown onto a variety of surfaces and sprays out spurts of ink in a circular motion for a short amount of time.
 * The Squid Beakon is a device that allows teammates to Super Jump directly to its location.
 * The Suction Bomb sticks to walls and other surfaces, exploding shortly after.

Special

 * The Bomb Rush allows you to throw unlimited Splat, Burst, or Suction Bombs without consuming ink for a short time.
 * The Bubbler is a spherical force field that rebounds enemy attacks and can be spread to teammates. It is available for a short amount of time.
 * The Echolocator reveals the locations of all enemies for teammates to see.
 * The Inkstrike can be placed using the Wii U GamePad and causes a large, swirling vortex of ink to appear.
 * The Inkzooka shoots tall, narrow twisters of ink in rapid succession, allowing for quick placement of linear paths and splattering of enemies.
 * The Killer Wail blasts a large sound wave in a certain direction that obliterates all enemies in its path.
 * The Kraken allows Inklings to temporarily transform into large, invincible, kraken-like creatures with enhanced mobility and power.

List of Weapon Sets
In Splatoon, each weapon comes as a predefined set. For example, the standard Splat Roller comes with the Suction Bomb and the Killer Wail as its sub and special weapons, respectively. You cannot have a Splat Roller with the Seeker and Inkstrike, as there is no predefined set for the Splat Roller that includes the Seeker and Inkstrike.

However, there are alternates of every classes. An example of this is the Krak-On Splat Roller, which uses the Squid Beakon and Kraken rather than the Suction Bomb and Killer Wail that the classic Splat Roller sports.