A relaxed Kawa-Tengu that lives on the Youkai Mountain, boarding with other Tengu. Marmoris is one of the editors for the newspaper, often sitting by rivers to focus on reading the material so the noisy tengu at home don’t disturb her. Her ability is creating mirages and illusions to deter any humans and danmaku-impulsive Youkai that interrupt her quiet work. She seems to have sensitive eyes, having considered getting glasses, but she’s put it off for at least a hundred years.

Marmoris is smarter than she seems as she spends a lotttt of time reading on her own, whether its books or the articles she edits. With this she's up to date on most happenings and well versed in history. News articles also include columns for advice and sayings that she'll relay to others unconsciously. Usually its helpful, but sometimes her answers might be wrong. She's a natural chatterbox when given the chance, even though she prefers to be alone when diligently working. As a tengu, her manner of speech may come off as vain and bragging, but she just talks about herself often because she doesn't like to bring up the personal lives of those around her. She's got good stories about her long life too so it can be interesting. Acting like a cat with "multiple lives", she has a lack of regard for her wellbeing because she has a long life to correct any mistakes whenever she wants. She may go a couple days forgetting to brush her hair or groom her wings, or have a messy room until her superiors do inspections. She also needs glasses pretty badly, most objects about 15ft+ being blurry, but she keeps forgetting.

During her youth, Marmoris was raised along the middle of the Tengu hierarchy within Gensokyo’s Youkai Mountain. She can remember what the mountain was like prior to the inception of the Moriya Shrine, but one constant was the unchanging nature of the Tengu around her. Prideful, self important, willing to raise their kind to perfection while disregarding the sonder of other beings. As a young tengu, Marmoris was encouraged to dip her toes into all sorts of past times, skills, to find her calling. She was swayed by the popularity of literary arts like journalism eventually, finding comfort as an editor.

Early on she’d been told her style of writing was fantastic, but she didn’t consider herself very good at writing stories given her lack of experience outside of her society, perhaps feeling that her own life didn’t stand out enough to be an interesting tale. If there was someone intriguing enough that she’d met so far, it’d be her longtime friend, Toyo, but not herself. So she figured her diction would at least pinpoint what other writers were trying to convey. Work became easy for her, corrections comparable to working on a jigsaw puzzle until proses felt complete, yet she found herself not entirely focused. The noise of her rowdy kind was more than a distraction, from the loud gales trailing behind flying crow tengu, to unwelcome visits to solicit Marmoris to read newspapers that she’d never heard of. It became time to look around for peace and quiet if she wanted to get work done.

The winding rivers of Youkai mountain seemed like the perfect spot for a kawa tengu like Marmoris, but it had its own limitations; lost, wandering humans asking for directions, fairies conspicuously peering over her shoulder with even more questions than a human, and the occasional meeting with the Moriya family. Scratching the surface of Gensokyo for over a year, Marmoris felt that she was still surrounded by uncomfortable noises. Lamenting to an Oni she’d come across, she was redirected to Gensokyo’s underground, a much different world she’d only heard stories of. But when she asked the Oni if a notoriously loud and boisterous place was to pull her leg, the Oni said it becomes white noise when you feel at home somewhere. Complete silence…that’d just be an uncomfortable loneliness. Taking her word for it, Marmoris decided to visit the underground.

Surely enough, she could hear the brash festivities outside of her room at an inn; instruments being played, children laughing and yelling, the sound of danmaku back and forth. Figuring she wasn’t going to get any work done, she went to see what was so interesting, roaming crowds and entertainers only to stumble upon an Enenra’s performance. Drawn into the smoke, the Oni was proven right; every surrounding sound seemed to become invisible in an instant. When she heard Kemu sing for the first time, Marmoris found an intoxicating sound, a voice she could listen to forever. Charmed, she reached out to the songstress after she was finished, just as enchanted by her speaking voice. To accompany a stranger and give them a tour for the day, Kemu didn’t mind as it wasn’t the first time, but both found the other so interesting as the day went by that they couldn’t just spend one day together only. Kemu was drawn to the fact that Marmoris answered any question of what Gensokyo’s surface was like, a varying landscape much more wonderful than the depictions in paintings Kemu collected. That curiosity was evident enough that Marmoris invited her to visit one day, spurring the back and forth visits between the two and their homelands.

While Marmoris went back to fulfilling her editor work at home, it became more tolerable since meeting Kemu. Just the thought of her clouded away any distractions, but being lovestruck itself was one as well. She wasn’t one to believe in love at first sight(or other senses), but in the long time that she gets to know Kemu, she finds herself falling more and more for her. Once they eventually realize it’s a mutual feeling, they do begin dating, but living together isn’t something they would do just yet out of preference. They’re self sufficient and work where they live, and extended stays with the other give them a comfortable glimpse of what it’d be like to be side by side for so long. As Youkai they have long lives either way, so they could also move in together in the future. Long times apart don’t make them act any different either, always acting as if they’re continuing a conversation, doing so at times if they frequently send letters to each other. Perhaps sharing so many years together has led Marmoris to personally think their relationship is mainly playful and relaxed like that of a happily married couple, but there's always a moment or two that they get butterflies.

"Kemu's hands are the softest, maybe because she covers them so much." Marmoris and Kemu have been dating for a handful of years, with the dynamic of an established elderly couple that evens out mutual pranking with reciprocated affection, undoubtedly with a lack of shame around the other. While they are both prideful enough to not show others their vulnerable sides, they know each other inside and outside enough, past the stages of secret sharing long ago. Overall they're casual and often take turns visiting each other.

"Oi, Toyo! This pile's getting too big that I can hardly walk around your house. Seriously...if you start cleaning right now I'll even help you out. Such a handful." Two youkai girls as close as sisters, with Marmoris playing the role of the big sister for as long as she's known Toyo. She's pretty much seen her confidence and trust build over the years, Toyo still easily worried over for a number of reasons, but there's a lot they've celebrated over the years. They hang out very often, a bit less now that Marmoris has a girlfriend, but maybe Toyo feels a little lonely that she's putting in more effort to instigate gatherings. They know their lives are long, so there's no rush even so.

"Micchan, what are you up to? Oh, don't wanna show me? I'll assume it's a surprise for me then, hehehe. Just kidding, don't worry about it. I swear I didn't see anything." A playful pair, except Mija is a bit more mature and doesn't entirely like being treated like a kid by others, which she can tell Marmoris does a little by the change in intonation. They get along for the most part, behaved around Kemu at all times, but when alone Marmoris likes to tease her a little or play pranks. Mija won't say it but she thinks Marmoris' cool sides are in her writing abilities, and she refuses to let Marmoris find out she likes to write too or she'll die of embarrassment.