Jellyfish

Jellyfish are creatures found in Splatoon. They can be observed walking around Inkopolis, wearing various articles of clothing. They are the second-most common creature in the city, but most do not speak Inkling and cannot be interacted with.

Description
Unlike Inklings, jellyfish look fairly similar to their aquatic counterparts, with the most significant change being that their bodies have taken on a more humanoid shape. They have large, round heads, with their only facial features being a pair of very close-set eyes with square-shaped pupils and no visible irises. They have a pair of upper tentacles that serve as their arms, and a ring of eight lower tentacles that serve as legs. A jellyfish can stretch its "arm" tentacles to several times its body length at will. Being quite gelatinous, jellyfish noticeably jiggle when they move. Through their translucent skin, squishy innards can be seen. Greenish-blue skin seems to be uniform across the species, with the exception of Jelonzo, whose skin is pure blue with a slight purple tinge in some areas.

Though jellyfish have been shown to wear a variety of clothing, most only wear a t-shirt. Many of their shirts are just smaller versions of Inkling shirts, such as the Pirate-Stripe Tee and the Black Squideye. During a Splatfest, all jellyfish in Inkopolis Plaza wear a Splatfest Tee in support of their chosen team. However, their version of the shirt lacks the wristband, as they have no wrist to wear it on.

Jellyfish are capable of giving off light, possibly from bioluminescence, an ability some real-life jellyfish such as the crystal jelly possess. Jelonzo appears to glows slightly, which has been confirmed by Callie; she often mistakes him for a "glowing ghost", as seen in one of her comments on Bluefin Depot. In addition, all jellyfish in Inkopolis Plaza give off a very faint green glow during a Splatfest, seen only on the ground around them.

While most jellyfish have never been heard speaking, Jelonzo's voice has been heard. It is somewhat high, being very close in pitch to Annie's, but louder and clearer. It is possible that other jellyfish have a similar voice.

Jelonzo
Jelonzo is a blue jellyfish that owns Jelly Fresh, a clothing store in Inkopolis. He is the only jellyfish in the game who can be interacted with.

DJ Lee Fish
While little is known about DJ Lee Fish, their name seems to suggest that they are a jellyfish. They are a musician; four variants of their song Lookin' Fresh are heard in the shops of Booyah Base.

Appearances
Jellyfish do not appear in Ranked Battles.

Inkopolis
Jellyfish can be seen in and around Inkopolis Plaza, performing various activities.
 * Two jellyfish operate the air traffic control center above Inkopolis Tower.
 * Jellyfish stroll around the plaza, wearing different pieces of clothing.
 * Some jellyfish can be found sitting on benches, both inside and outside the Plaza.
 * Below the Squid Sisters' studio, a jellyfish can sometimes be seen dancing beside a pillar.
 * A jellyfish often stands at the train station behind the Plaza.
 * Four jellyfish can be found standing near a tree outside the Plaza.
 * During a Splatfest, jellyfish congregate in front of the Squid Sisters' trucks, wearing Splatfest Tees and dancing to the music.

Arowana Mall

 * Many Jellyfish can be seen behind the shop windows.

Blackbelly Skatepark

 * Some Jellyfish can be seen outside the skatepark.

Bluefin Depot

 * Across the water, outside the bounds of the Stage, there is a lone jellyfish which can only be seen up close by zooming in with a scoped Charger. It is not always there, but when it is, it either sits peacefully by the edge or stands and stretches its tentacle into the water.
 * On the opposite side, along the wall of Miiverse posts, there are sometimes a few jellyfish standing or sitting around. Some of them seem to be spray painting the wall.

Camp Triggerfish
Jellyfish can be seen across the lake at Camp Jellyfish.
 * A jellyfish can be seen hopping around in a canoe.
 * Other jellyfish tend to stand on the Camp Jellyfish fort.
 * One or two jellyfish at Camp Jellyfish can sometimes be seen crouching by the water and noticeably vibrating. The reason for this is unknown, and it is not seen in any other location.

Flounder Heights
Jellyfish appear to live in Flounder Heights, and can be seen performing daily activities there.
 * Two jellyfish can be seen behind each glass door. One appears to be dancing and cheering on battling Inklings, while the other stands with a tentacle on its "hip."
 * A group of jellyfish play at the nearby playground.
 * There are two balconies on either side of each team's Spawn Point, with a single jellyfish on each one. One of them is usually dancing.
 * During a Splatfest, with the lights in the apartments on, silhouettes of jellyfish can be seen in some of the windows.

Hammerhead Bridge

 * Several Jellyfish can be seen dancing or sitting down on the top railings of the bridge.

Kelp Dome

 * Outside the boundary of the Stage, a few jellyfish, possibly workers for the greenhouse, can be seen.

Mahi-Mahi Resort

 * A few jellyfish sit in inner tubes and lie on inflatable rafts on the water.
 * Some jellyfish (along with horseshoe crabs) lie on chairs and towels by the poolside; others simply walk around.
 * A jellyfish wedding can be seen in the distance.

Moray Towers

 * There are four jellyfish next to the ramp on each side of the stage, standing next to a car inside a parking lot.
 * A couple of jellyfish can be seen doing construction work on some scaffolding on a nearby tower.

Museum d'Alfonsino

 * Several jellyfish can be seen painting inside a studio outside the stage's boundaries. These jellyfish were shown in the November 12, 2015 Nintendo Direct.
 * Some jellyfish in red berets and smocks usually stroll around inside an inaccessible portion of the museum.
 * There are countless paintings and sculptures of jellyfish scattered throughout the stage.

Port Mackerel

 * Behind the glass forming the boundary of the Stage, a jellyfish can sometimes be seen directing a forklift.
 * Also behind the glass, a pair of jellyfish can sometimes be seen talking to each other. One is smaller than the other; it may be a younger jellyfish or simply a short one.

Piranha Pit

 * A jellyfish stands in a raft floating on the surrounding water.
 * A worker jellyfish waves at the Pit from a small platform with a tent and a couple of weapons.

Saltspray Rig

 * Jellyfish often stand on the towers surrounding the map, either alone or in pairs. Some of them dance.

Urchin Underpass

 * Some Jellyfish can be seen cheering from behind the secret alley windows.

Walleye Warehouse

 * Outside the stage's boundaries, jellyfish can be seen walking around and spectating the current battle from the warehouse's large windows.

Trivia

 * Jellyfish are featured in many of the Arcade Games.
 * Jellyfish may have large sums of money, given that they are often seen in cars, can afford to live at the expensive Flounder Heights, and that Camp Jellyfish seems to be significantly larger and more elaborate than Camp Triggerfish.
 * Some, if not all, graffiti in Inkopolis Plaza is implied to be made by jellyfish; as stated in a developers' interview, jellyfish are known to create a large amount of graffiti.