Soompi Spotlights Six K-Pop Idols With Non-Mainstream Style: Soyeon, Hikaru, Rei, Ningning, Sieun and Chaeyoung

Soompi's Feature Puts Six Distinctive Idols in the Spotlight

On 14 October 2026, Soompi published a feature by sammilee titled '6 K-Pop Idols Who Are Known For Their Non Mainstream Style'. The article opens by acknowledging that fashion is subjective, and that while mainstream trends have their merits, they are not for everyone. It then highlights six idols who stray from the mainstream and wear outfits that show off their own style: i-dle's Soyeon, Kep1er's Hikaru, IVE's Rei, aespa's Ningning, STAYC's Sieun and TWICE's Chaeyoung.

This list is not a ranking or a definitive guide, but it does reflect a growing conversation in K-pop fandom about personal style. For idols, whose public image is often shaped by group concepts and professional stylists, a recognisable individual aesthetic can be a way to connect with fans on a different level. Soompi's feature invites readers to look at these six as examples of how non-mainstream choices can become a signature.

What 'Non-Mainstream' Means in K-Pop Fashion

The term 'non-mainstream' can cover a wide range of looks. In K-pop, mainstream fashion often aligns with current trends—think sleek minimalism, coordinated group outfits or whatever is popular in the moment. Non-mainstream style, by contrast, might draw on subcultures, vintage references or avant-garde ideas that are not widely seen on the average street or stage.

Soompi's feature illustrates this diversity. It describes Soyeon's style as gritty and edgy, with a unique haircut and a frequent rotation of black outfits with chunky metal hardware. Hikaru is noted for mixing classic feminine pieces with grungier elements like ripped denim and thick-soled boots. Rei has recently favoured a vintage, old-school glamour aesthetic. Ningning's recent looks are described as femme fatale, with sharp makeup and meticulously styled hair. Sieun embodies a sweet, girly style with ruffles, ribbons, bows and sparkly jewellery.

Chaeyoung is portrayed as avant-garde, unafraid of out-there pairings and a 'more is more' approach. Each of these represents a different way of stepping outside the mainstream.

Soyeon and Hikaru: Punk Edge and Contrasting Textures

Soyeon, the leader of i-dle, has long been known for her bold fashion as well as her music. Soompi notes that she makes a statement in both areas. Her style is characterised by a unique haircut that complements a gritty, edgy look. Black outfits with chunky metal hardware are a frequent feature on her Instagram, and while she can wear a girly look too, the feature suggests punk is her true style. This consistency gives her a distinctive visual identity that fans can easily recognise.

Kep1er's Hikaru offers a different approach to non-mainstream fashion. According to Soompi, her mastery comes from mixing classic feminine pieces with grungier aspects. The effect is immediately attention-grabbing. Ripped denim and thick-soled boots are paired with ruffles or delicate jewellery, creating combinations that are not commonly seen. This juxtaposition of soft and hard elements allows her to make fashion her own without committing to a single aesthetic. It is a style that rewards careful observation.

Rei and Ningning: Vintage Glamour and Femme Fatale

IVE's Rei shows that alternative style does not have to mean all-black outfits and fishnet tights. Soompi observes that she curates her looks in a way that is uniquely her own. While she has dabbled in many sub-genres over the years, her recent looks often have a vintage, old-school glamour that is rarely seen in today's mainstream. This choice sets her apart, drawing on historical fashion references rather than current trends. It is a style that feels both timeless and personal.

aespa's Ningning, meanwhile, has been delivering what Soompi calls femme-fatale looks. The article describes sharp makeup, meticulously styled hair and fabulous dresses. While aespa as a group has a memorable alternative style, Ningning's recent fashion is outstanding in its own right. Each look is described as a fashion tour-de-force, suggesting a high level of commitment to a polished, powerful aesthetic. This is non-mainstream in the sense that it is more dramatic and stylised than the typical everyday idol look.

Sieun and Chaeyoung: Sweet Details and Avant-Garde Maximalism

STAYC's Sieun is described by Soompi as a girly girl through and through. Her style features ruffles on ruffles, ribbons and bows, and sparkly jewellery. The overall effect is so sweet it 'will give you cavities', according to the feature. While this might not be mainstream, it fits her perfectly. Every outfit is detailed from head to toe, making her look carefully considered and distinct. This shows that non-mainstream can be hyper-feminine and delicate rather than edgy.

TWICE's Chaeyoung takes a very different approach. Soompi presents her as an artist whose fashion is art. She is not afraid of out-there pairings and avant-garde styles that others might avoid. Her secret, the feature says, is 'more is more'. Mixing patterns, silhouettes and layers creates a statement look that grabs attention immediately. Chaeyoung's maximalist approach is perhaps the most overtly experimental on the list. It demonstrates that personal style can be playful and fearless.

Why These Six Stand Out and What It Means for Fans

Soompi's feature is a reminder that in K-pop, fashion is more than just clothing. It is a visual language that can express personality, mood and artistic inclination. For idols, who are often seen through the lens of a group concept, a strong personal style can be a way to assert individuality. The six idols highlighted here have each developed a recognisable aesthetic that goes beyond whatever is trending.

It is worth noting that this list is not exhaustive. Many other K-pop idols also have distinctive styles that could be described as non-mainstream. Soompi's selection simply offers a snapshot of some of the most talked-about examples. The article also does not claim that these idols never wear mainstream outfits; rather, it points out that they are known for their non-mainstream choices. Fashion remains subjective, and what looks unconventional to one person may be the height of style to another.

For fans, these idols can be a source of inspiration. Whether it is Soyeon's punk edge, Hikaru's texture mixing, Rei's vintage glamour, Ningning's dramatic elegance, Sieun's sweet details or Chaeyoung's avant-garde layering, there is a range of approaches to learn from. The key takeaway is that personal style is about curation and confidence, not about following a rulebook.

The Takeaway: Individuality in a Trend-Driven Industry

Soompi's feature highlights six idols who have made non-mainstream style part of their public identity. In an industry where trends move quickly and images are carefully managed, their choices stand out. They show that it is possible to be both a K-pop star and a fashion individual. The article does not speculate about their motivations or private lives; it simply observes their visible style choices.

That is enough to make a point: fashion can be a form of creative expression, even within a highly structured system.

As K-pop continues to globalise, interest in idol fashion is only likely to grow. Lists like this one help fans discover new looks and appreciate the artistry behind them. Whether you are drawn to edgy punk, delicate girly details or maximalist experimentation, there is something in this group to admire. The six idols Soompi highlighted show that non-mainstream style is not a single look but a spectrum of personal expression.