Mato, Oro, Sheo and Sly Hollow Knight

Common House: Forge at the Top of the World

Their shared home was a great, secluded forge-dojo located in the very heights of Hallownest (possibly in the Howling Cliffs region before that area fell into disrepair).

The Abode of Mastery: It was a vast stone complex where a forge blazed perpetually, and the air was filled with the clang of steel and the heavy smell of soot. An icy wind whistled outside, but inside, the fire and intense training warmed the atmosphere.

The brothers' daily life: They shared a common dining hall, where they shared a modest meal after grueling training sessions, and a training ground carved directly into the rock. Along the walls stood racks containing countless prototype nails, which Sheo constantly reforged, trying to achieve perfect balance.

1. Master Oro

Appearance: A large, broad-shouldered beetle with a stern expression on its mask.

Attire: He wore a heavy, coarse cloak of a reddish-brown (earthy) hue. His posture was always wary and reserved.

Weapon: A heavy combat nail, adapted for his signature slashing attack, the Slash.
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2. Master Mato

Appearance: Oro's twin, possessing the same massive shell and body structure.

Attire: He wore a similar warrior's cloak, but in a blue-gray (or muted gray) color. Unlike the sullen Oro, Mato held himself more proudly and upright.

Weapon: A long nail which he used for his sweeping, circular Hurricane Punch.
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3. Master Sheo
Appearance: The strongest and most gifted of Sly's three students. Twin of Oro and Mato.

Attire: He wears the same majestic and pure warrior's cloak as Oro and Mato, which completely covers his powerful body.

Weapon: Sheo wields a fully-fledged combat nail, which he uses to perform his devastating Great Smash.

The Great Nail Master Sly

During his time training the brothers, Sly, at the height of his greatness, looked like this:
Height and Build: Despite being considered the greatest warrior, Sly remained a tiny bug (slightly larger than a young vessel). However, his small stature was compensated for by his incredible jumping ability and speed.

Attire: He wore a bright pink (purple) master's cape.

Weapon: He wielded his legendary Great Nail, a massive weapon several times larger than Sly himself, giving him a formidable and monumental appearance in battle.

The Great Nail Guru Sly

In his prime, he was a legendary and fearsome warrior, the greatest swordsman in Hallownest, whose skill surpassed even that of the king's knights.

Appearance and personality: Despite his diminutive stature, he exuded immense confidence and authority. He wore a clean, unworn master's robe. In those days, Sly was not burdened by a thirst for geo or the madness of plague; he was a stern but wise mentor who saw the potential of each of his students and was genuinely proud of them.

Fighting Style: He possessed incredible speed and agility. His giant nail (which seemed unwieldy given his size) moved with lightning speed in his hands. He mastered all three nail techniques, combining them into unpredictable and deadly combinations.

Nail Master Mato

Before his seclusion in the Howling Cliffs, Mato was the most devoted, idealistic and emotional student, for whom the concepts of honor, loyalty and brotherly bonds stood above all else.

Appearance and personality: A proud and strong warrior, always careful about his posture and the condition of his equipment. He respected Sly unconditionally and treated Oro and Sheo like brothers. Mato was the life and soul of their group – it was he who tried to bring the brothers together, organized joint training sessions, and believed in the eternal union of the four of them.

Fighting Style: His style was based on iron discipline, defense, and devastating counterattacks. His signature move, the Hurricane Strike, was furious and sweeping in his youth. Mato poured his heart and soul into every swing, a sincere desire to protect what was dear to him.

Nail Master Oro

Before locking himself away at Kingdom's Edge and taking Geo as his apprentice, Oro was an ambitious, proud, and secretive fighter who desperately sought to prove himself as equal to his brothers.

Appearance and personality: Gloomy, focused, prone to loneliness even when living together. Oro always seemed a bit distant. He was consumed by internal rivalry (especially with Mato). Something happened between them in the past that left Oro with a heavy burden of guilt, causing him to become suspicious and withdrawn.

Fighting Style: Calculated, sharp, and pragmatic. Oro sought out weaknesses in his opponent's defenses and struck with precision. His Slash symbolized his desire to always stay ahead, closing the distance and defeating his opponent with one swift, unexpected strike.

Nail Master Sheo

Before trading his nails for an artist's brush in Greenway, Sheo was Sly's most talented, versatile, and inquisitive student, who felt constrained by the confines of a purely military profession.

Appearance and personality: Calm, observant, and contemplative. Sheo possessed an innate sense of beauty. While Oro and Mato argued about honor and power, Sheo could spend hours watching the light fall on a nail blade. He loved his brothers, but often acted as a peacemaker, smoothing over their conflicts.

Fighting Style: The most fluid and unpredictable style. Sheo perceived combat as a dance or an art. His Great Strike was the pinnacle of pure mastery—perfect in form, precise to the millimeter, and devastating.