What about subcultures in Mogdir, Zareen’s biggest rival and contrasting equal in power?
Mogdir Kingdom is a large territory with many diverse cultures, so I imagine there are a lot of different subcultures within them. Here are a small handful I've come up with so far:
Green Peppers: Red elf luddites who oppose all things high-tech. Many of them have traveled from Zareen Empire or the Damijana Empire to get away from the busy urban lifestyles there. While there are many luddite cultures on Looming Gaia, green peppers are unique because they're specifically trying to get back to their ancient Boanningwad roots.
They study Boanningwad culture and lifestyle, and imitate these things as much as possible in their daily life. You can find green peppers in many places across the world, but the vast majority live in Mogdir Kingdom because of its proximity to the high-tech empires, plus its culture is conducive to their chosen lifestyle.
This group calls themselves "green peppers" because their species has changed from green to red just like the fruit, and they feel they must uproot their lifestyles to return to their green state.
Feathermouths: These are basically the "crazy horse girls" of Mogdir Kingdom, but instead of horses, their passion is in pegasi. Feathermouths can be anyone, but stereotypically they are upper-class fae women, usually elves or gnomes. When they're not riding or caring for their pegasi, they are talking about them non-stop to anyone who will listen. Those who can't afford pegasi of their own like to volunteer at local stables to spend time with them.
They are called "feathermouths" because pegasus wings are known to shed feathers during flight, and these feathers often end up in their jockey's mouth. Can you even call yourself a feathermouth if you haven't swallowed a feather or two?
Bouquets: Many Mogdiri people incorporate plants into their wardrobe, and they have done this since ancient times. But bouquets take this a step further. This is a fashion-based subculture that celebrates flowers in particular. Bouquets wear clothing made from real or fake flowers, in such elaborate designs that it can often look cartoonish.
Their goal is to look like a vase full of beautiful blooms, so they usually don some sort of corset and a skirt, while the upper half of their outfits are bursting with flower motifs, and they may wear flowers in their hair or ornate hats or headwraps. Sometimes their big flowery hats are so large, they struggle to fit through doorways. They are known to attract bees everywhere they go, but the bouquets have a reverence for these insects so they don't mind.
Bouquet subculture began in Mogdir Kingdom but has spread to other lands in modern times, most notably Seelie Court and Matuzu Kingdom. In foreign lands it is more popular with women, but in its homeland of Mogdir Kingdom this style is equally popular with men and women.
Scrungers and Mudleeches: Scrunge and mudcore are two popular "alternative" music genres that were born in Mogdir Kingdom. Scrunge came from Terrian districts in the western Arcadian Forest, while mudcore came from Aquarian districts in Waterwalk. These genres sound very similar to the untrained ear, but their fans insist they couldn't be more different. These fans are called scrungers and mudleeches respectively, and likewise, it can be hard for outsiders to tell them apart because they tend to wear similar fashions, both trying to look as shabby and unapproachable as possible.
Scrungers wear clothing made out of course materials like burlap, in dull, dark colors, and often smear their faces with dirt. They take pride in not washing their hair, so it tends to get stringy or matted. Mogdiri fauns are responsible for inventing this style and music, as a response to their oppression by the local fae. Mogdiri fae at the time pushed a colorful and "fresh" aesthetic inspired by spring blooms and perfectly manicured gardens. Many local fauns did not strive for this aesthetic, as they were satisfied with their more traditional districts in the wilderness. But the fae pushed this lifestyle onto them regardless, and the faun youth responded with scrunge, rebelling against manicured perfection and instead reveling in the uglier sides of nature, like dirt and decay. Likewise, scrunge music has an ugly, abrasive, and feral sound.
Mudcore has a similar history, born as a response from rebellious young sirenes who were sick of their own culture's obsession with vanity. Mudleeches make a point to cut their hair in choppy, asymmetrical styles and leave it uncombed. They wear a lot of mismatched clothes to strain the eyes and thorny accessories as to look unfriendly. Mudcore music sounds quite similar to scrunge, but with a notably "watery" twang to it. The lyrics of both genres emphasize anger towards authority and the status quo.
While scrunge began with fauns and mudcore began with sirenes, both subcultures have spread out to other species in Mogdir Kingdom, and today you can find a diverse range of fans. However, most fans do tend to grow out of it as they age, so it's rare to see adult scrungers or mudleeches. It's primarily a scene for teenagers and young adults.
Fauxseelie: Much like rusties, fauxseelie are obsessed with a foreign culture. But instead of Damijani culture, they are obsessed with Seelie culture. This isn't too surprising, as Mogdir Kingdom and the Seelie Court have been allied many times in the past, and there is a lot of travel and trade happening between these lands. All Mogdiri have been exposed to elements of Seelie culture in one way or another at this point.
But the fauxseelie develop an obsession with all things Seelie, viewing the Seelie Court as a mystical, exotic kingdom full of beauty, elegance, and adventure. There are actually two branches of the fauxseelie subculture: bright fauxseelie, who obsess over Seelie culture, and night fauxseelie, who obsess the Unseelie culture. However, it's also common for this group to have an equal fascination with both courts, and even the continent of Umory-Ond as a whole.
Fauxseelie consume a lot of media from this foreign land, eat its traditional cuisine, prefer to wear fashions that are popular there, and may even put on a fake Seelie accent. To outsiders, fauxseelie are considered just as cringy and weird as rusties, so most of them eventually grow out of this phase as adults. You may find clusters of adult fauxseelie, but they are...not popular, to say the least. They kind of hang out in their own little nerd groups.
That's all I have for now!