ALRIGHT! So I’ve been building up these races for awhile so it’s finally time to get stuff out there
 
SeaQuestria:  
Current Duke: Sir Tidal Song  
Prince: Phorcys  
Princess: Brizo
 
Mermares:  
Central Kingdom: Atlantrot Ocean  
Attributes: Long noses, curled tails, lots of fins, softer colors, magical singing,  
These are the highest class of SeaQuestria. The mermares are said to be the first of the races brought into being. They are the wealthy class, living in lush castles with their cities being the most economically successful. Most consider themselves higher than any of the other races and the overall Duke of the Sea is a mermare.  
While all of the seas are under Queen Luna’s control, the individual kingdoms have their own rules with one king on top. The leader is always a male but the city rules are always female. it basically works like this, one Duke oversees all the kingdoms and each kingdom has one Duchesses who report back to the Duke.  
The culture of mermares is one all about image. Reputation and physical appearance is everything. One reason the mermares despise the other races is that they consider themselves to be purebred, anything with hooves is considered “lesser”. Not every mermare is like this but most are and growing up they are taught to be that way.
 
Alliances:  
Hippocampi: Tolerates them as their above-sea military is useful.  
Merponies: Require their craft/goods and appreciate them being the closest relative to Mermare.
 
Hippocampi: Indireign Ocean  
Central Kingdom: Mount Aris (On the mountain and below)  
Attributes: Ability to switch between sea and sky, very agile, able to use magic, very bright colors  
Hippocampi are the race seen prominently in MLP Cannon. The only difference here is that they were a race of seapony first then gained the ability to go on land. They became over ambitious as a military focused group and wanted to take their armies above the seas. (for context, Land dwellers had started to find their islands that marked their home and were polluting their home) With the lead of Duchess Stella, they found the magic pearl’s true potential and rose to the skies as hippogriff. They ruled in peace for many many years until the accursed Storm king ravaged the land out past the islands. He was approaching soon and the hippogriffs had no choice but to return to the sea to rejoin the half of the tribe who never left. They relied on the Mermares grace to be able to rebuild their kingdom with half the population suddenly back. Since then they have been the personal military of the mermares.
 
Alliances:  
Mermares: Mentioned above  
Land Dwellers: MLP cannon
 
Merponies:  
Central Kingdom: Antartequine Sea  
Attributes: Seal-like faces, slick bodies, darker colors, close connection to the sea, powerful tails, thicker overall (blubber)  
The Merponies are one of the most reserved SeaQuestrian races. They are a people of art and craft, the tinkerers of the undersea world. Their deeper connection with the flora of the sea allows them to manipulate and use materials to create masterful art pieces or brilliant new inventions. While SeaQuestria is leagues behind Equestria in terms of ‘technology’, they have an extremely complicated and profound use of art that goes deeper than any Equestrian could make. Because they use so much material for their work, they are also in charge of most of the gardening in the kingdoms.  
Merponies live in the colder climates of the sea. While some can be found in warmer waters, their thick blubber makes them able to withstand icy cold water. When visiting the warmer living races, they use a specific spell taught to all merponies that keeps a thin veil of cold water surrounding them. It lasts 3 days and must be recast before the time runs out otherwise they cannot perform the spell until they get back to cold water.  
Their culture is one of self sacrifice and gentleness. They are always taught to give back whatever you take and are all very conservative. Some choose not to speak and it’s pretty much a majority of introverts. The elders are highly respected and only elders may serve as Duchess. Their cities are much smaller and more ‘rural’ compared to the other races but not many visit due to the cold water. They continue the old Greek tradition of Xenia where if a stranger approaches and asks for help, you help without question and always leave your door unlocked.
 
Alliances:  
Everyone, they don’t really do enemies
 
Sea Ponies:  
Central Kingdom: Pacifilly Ocean  
Attributes: Half pony, half Mermare, can have wings, horn or neither, always have pony ears, only race with fur, only ‘spike’ fins, manes  
The lowest of the main races are the seaponies. Seaponies are also the smallest race as they stemmed from a land-dweller and Mermare relationship, making them “un-pure” in the eyes of Mermares. They have unique abilities to either fly in the air, use little bits of Equestrian magic or even walk on land if given Earth pony magic. Even with their strong adaptability, they remain under the Mermare’s rule. The seaponies are used as the ‘worker class’ doing odd jobs and running stores that the other races don’t want to do. Most are blissfully unaware that their situation is poor but the few who figure it out often leave or are imprisoned. In recent years, since Queen Luna reclaimed her throne after 1000 years, the Mermares have eased off and simply leave seaponies to do their thing somewhere away from the major cities. Because of the already low population to begin with mixed with the harsh punishments in the past, there really aren’t that many seaponies around. Just a few small, scattered, towns and one major city for their whole race.  
Their culture is one based in family. Seaponies very much value their families and often have multiple generations living under one roof, all working for each other. The duchess herself often visits many families, trying to bond with as many as she can making their kingdom the most tight knit in SeaQuestria. While they have to work long days, they are mostly content and aren’t in the worst conditions.  
Seaponies are strictly warm water SeaQuestrians and almost never see the Merponies. The seaponies, however, are the only race (well besides hippopriffs now) to have a strong connection to the land dwellers. The Sytonies, seaponies gifted with earth pony magic, take the goods to the surface for trade. Often, some Aereonies, seaponies gifted with pegisai magic, will follow, however they cannot remain out of the water for longer than 5 hours. The final group, the Perytonies, gifted with the magic of Unicorns, stay behind and can only really interact with sailor ponies (they’re the ones that started the Sirens myth back up again, freaking out sailors). The three tribes live in harmony and act similar to the three Equestrian tribes.
 
Alliances:  
Mermares: the Mermares rule over them
 
Depth Dwellers:  
Central Kingdom: Unknown, located somewhere in Mareianas Trench  
Attributes: Long slender bodies, fins on arms act as second arms, manes, rigid back, angler light that can use magic, strongest users of magic, glowing eyes, cannot go to surface, dark colors with bright eyes and manes  
The Depth Dwellers are a different kind of Seapony. When Luna first ruled over the seas, before nightmare moon, most SeaQuestrians disregarded her and her night, casting her out as a weak ruler and the night only hindered them. When Luna finally turned and took over both Equestria and SeaQuestria as nightmare moon, a few loyal SeaQuestrians choose to side with the Queen. When she was banished, they continued to remain loyal but were banished by the other SeaQuestrians to the depths where they were forced to adapt to the freezing, dark depths of the Mareianas Trench. In their struggles to adapt, they learned how to control magic, which saved them in the end. Slowly they took on the form they have now and the history books forgot about them. In present day SeaQuestria, very few know about the Depth Dwellers, only known as monsters to keep the children from misbehaving. Queen Luna has searched for them and continues but she has so far been unsuccessful in finding them.. Are they really gone for good?
 
Alliances:  
Unknown
 
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THAT WAS A LOT WOW
 
lol sorry I just really love this idea of a whole subculture (lol) beneath the seas of Equestria. I think I’ll do a post of their history but that’s for another time