MERFOLK RP — normal world but.. Merfolk exist! (humanity doesn't know, lol)

Timeline: Postmorden age for human society Year: 2026

Humans: Human society is the same, they're completely unaware of the existence of merfolk and believe them to be a mere myth and fictional story of the past.

On Merfolk — Their Nature and Common Traits

Merfolk are an amphibious people native to the oceans, long adapted to a life where pressure, salinity, and darkness vary as dramatically as weather does on land. Though they are capable of breathing air and surviving on the surface for extended periods, the sea remains their true environment—physically, culturally, and spiritually.

At a glance, merfolk appear humanoid from the torso upward, with arms, hands, expressive faces, and a skeletal structure broadly comparable to that of humans. From the waist down, however, their bodies diverge completely: legs are replaced by a powerful tail, its form, texture, and movement dictated by species. Some tails are laterally flattened for speed, others thick and armored for defense, others flexible and ribbon-like for maneuvering through reefs or tight spaces. Fins may extend from forearms, hips, backs, or necks, and many merfolk possess gills in addition to lungs—often hidden along the neck or ribcage, opening and closing rhythmically while submerged.

Species and Physical Variation

Merfolk are not a single uniform people but a broad classification encompassing countless species, each echoing a specific aquatic lineage. Shark merfolk tend to be large, muscular, and streamlined, with rougher skin, visible dentition, and an instinctive awareness of blood and motion. Reef-dwelling merfolk—those resembling clownfish, angelfish, or wrasses—often display vibrant coloration, frilled fins, and intricate patterns that shift subtly with mood or health. Eel merfolk are long-bodied and flexible, their movements smooth and serpentine, while crab or lobster merfolk may have hardened plates, jointed armor, and reduced tails in favor of powerful lower torsos adapted for crawling and anchoring.

Some merfolk exhibit bioluminescence, particularly those from deeper waters. This light may pulse along veins, spots, or fin edges and is used for communication, intimidation, or navigation rather than ornament alone. Others have ink sacs, electrical organs, or pressure-resistant eyes capable of seeing in near-total darkness.

Despite this diversity, interspecies recognition is instinctive. Merfolk can almost always tell another merfolk from a non-mer by posture, movement, and subtle behavioral cues that are difficult to articulate but immediately obvious to them.

Physiology and Lifespan

Merfolk physiology is remarkably resilient. Their organs are adapted to withstand rapid pressure changes, cold temperatures, and long periods without light. Most species heal faster than humans, though injuries sustained in deep water or magical contexts can linger.

Lifespan varies widely by species. Some reef merfolk live little longer than humans, while deep-sea species—particularly those adapted to slow, energy-efficient living—may live for centuries. Aging among merfolk is gradual and often marked more by changes in coloration, fin wear, or luminescence than by visible frailty.

Behavior and Social Disposition

As a whole, merfolk tend toward caution rather than aggression. Predatory species may appear intimidating, but open violence is rare outside territorial disputes or extreme scarcity. Most merfolk are acutely aware of balance: between hunting and conservation, between expansion and collapse. The ocean is vast, but it is not infinite, and this understanding permeates their behavior from a young age.

Curiosity is common, especially toward unfamiliar currents, ruins, or phenomena, but it is tempered by tradition and cautionary histories. Merfolk are taught early that survival depends not on dominance, but on adaptation—knowing when to press forward and when to retreat.

Solitude is not inherently stigmatized. While many species are social and colony-oriented, others are naturally solitary, and even within communal societies, long periods of isolation are considered normal and sometimes necessary. Silence, contemplation, and slow living are valued traits in many cultures.

Relationship to the Surface

Although merfolk can breathe air, the surface world is treated as an inhospitable border rather than a destination. The absence of pressure, the harshness of light, and the instability of surface waters make prolonged stays uncomfortable. Most merfolk who surface do so briefly, often out of necessity rather than desire.

Stories persist among merfolk about land-dwellers who believe the sea holds only myths where merfolk are concerned. This belief is neither corrected nor challenged; it is simply accepted as another current in the world, flowing parallel but never intersecting.

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Extinct or extremely rare species of Merfolk:

• Octavias: They were a colony of purplish octopus-like merfolk that were mostly females, instead of fish tails, they had purplish, dark tentacles they used to move around; nothing major, they were simple.. but also special thanks to the fact they could use magic thanks to special hearts they had. An Octavia could have up to three hearts if they were lucky enough (has the most magic, but it's also harder to control) and three-hearted Octavias usually ended in positions of power in their colonies— until a large creature one day attacked the colony and destroyed it, killing everyone with it, or, at least, that's what it's thought since no one has seen an Octavia in a long time.

• Sea Dragons: Very rare, little is known about them besides that they were deep sea merfolk with unique traits, not really resembling any aquatic creature in particular, snake-like with luminescent spots along long serpentine tails. Considered dangerous due to being fast, usually strong and quite large, not much is known about them.

• Beacons: Shiny Koi fish-like merfolk known for the shiny golden glow of their scales, looking pretty simple with no major physical traits besides their glow, and for the fact they're considered sacred and also extinct, believed to do 'god's bidding' since they were the ones that often showed up to fulfill prophecies of colonies— regardless of whether the result was something that pleased the colony or disappointed them. They were a mystery, and their sudden disappearance was also a mystery. Beacons are often included in religions most of the time as conduits of some gods.

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Apart Notes:

• Merfolk are amphibious creatures who reside in the depths of the ocean but can breathe on land, they are human-like with fish tails in replacement of legs, they also have some fins and other fish-like features. (Can resemble any aquatic animals: shark, octopus, crabs, eels, clown fish, among many more, etc, etc. And depending on what Merfolk species they are, they will have distinct features depending on the aquatic animal they resemble.)

• Merfolk are just fictional stories and legends for humans, thinking they are fictional creatures created in ancient myths that aren't actually real. So humans are completely unaware of merfolk.

• Merfolk have developed an underwater civilization themselves where humans can't reach, similar to colonies (marked by large castles on the centers and usually something that marks the limits of their territory), and also a hierarchy system. They divide themselves by species, for example: there's a shark colony, set in a specific depth and place ideal for sharks, there's a colony of jellyfish, etc. All with their own customs, rules, problems, etc. Some species live off colonies and are solitary (for example, mer hermit crabs live alone and are solitary and roaming.)

• While magic exists for merfolk and their civilization, they don't hold much power over it— but it is known that Octavias, an octopus-like type of merfolk, had special hearts (at times multiple ones, up to three hearts full of magic, the more hearts they have, the more magic they also have) that allowed them to use and practice magic. However, creatures somehow corrupted by magic become mini-gods of havoc, that tend to cause destruction and give colonies they pass by curses, very hard to defeat, and very aggressive.

• They have their own gods and religions apart from humans

• There are two particularly distinctive species of Merfolk that are nothing like any other aquatic creature: Sea Dragons (usually tall and with long tails, they tend to be strong, have luminescent spots on their bodies, and live deep in the harsher pressure depths of the ocean, considered aggressive and not usually seen in any colonies) and the Beacons (roaming, traveler mer with shiny gold tails that are said to travel to fulfill colonies' prophecies, they have this duty strictly since magic lines guides them to unfulfilled prophecies (practically drags the beacon to them if the beacon tries to swim away to not do it, but with enough will and rebellion they can break these links and stop the magic from dragging them), but they're not machines and all of them have their own personalities and their own identities. Rare but easy to notice once you see them— thought to be extinct since no one has seen one in a long time.)

• Prophecies are sacred, magical binds that are done when a colony has a very serious problem and doesn't know how to fix it or perhaps there's no way to fix it, so this prophecy is created so a beacon comes to help them. The prophecies can't be controlled, and sometimes, a colony will have to give something in exchange (for example, a prized live or particular, special and known individual's life, or something else) for the solution to their problem while others the beacon will just do all the work.