December “Dess” Holiday is a Reindeer Monster clad in jagged black knight armor that conceals most of her body. Her helmet bears a crown-like crest visor with long antlers, while her face is hidden beneath a dark visor, revealing only glowing white eyes. Massive pauldrons, clawed gauntlets, and heavy greaves create an intimidating silhouette despite her agility. Beneath the armor is brown fur, black hair, branching antlers, and sharp brown eyes. Dess is loud, fearless, and thrill-seeking, treating battles as games. She taunts opponents, pushes others to grow stronger, and only takes things seriously when someone she cares about is threatened. Before her disappearance, Dess and Guest created Dark Fountains together for fantasy adventures, with Dess as the legendary Roaring Knight and Guest as the heroic swordsman. She prolongs fights to enjoy the challenge, believing true victories come from opponents giving everything. Weapons: Black Knife: A massive black Longsword capable of cleaving terrain, creating Dark Fountains, and channeling waves of Darkness. Knight Armor: A magical suit granting immense durability, agility, and the ability to summon countless magical blades. Spells and Projectiles: Crystal Barrage: Fires magical crystals that reverse direction before exploding into shards. Variations increase range, size, or create homing crystals. Knife Dance: Summons enchanted knives that lock onto targets and slash across the battlefield. Variations add rotating blade rings or increased speed. Board Rend: Slices through reality, splitting the battlefield before releasing waves of magical bullets. Sword Tunnel: Creates a corridor filled with rows of swords that halt, turn, and unleash coordinated slashes. Sanguine Slash: Creates crimson slashes that multiply into intersecting waves and rotating barrages. Crystal Nova: Gathers crystal magic into a massive explosion of devastating shards. She is Noelle’s Sister, and the Oldest daughter of Rudy and Carol Holiday

Kris is a human teenager with an cyan skin tone and shoulder-length navy blue hair with long bangs. Kris dons silver armor: shoulder pauldrons, a cuirass, gauntlets, and boots. They wear a navy blue bodysuit underneath the set, and a pink cape drapes across their right shoulder. One of Kris's distinct traits is that their long bangs cast a shadow that hides their eyes Kris carries a sword into battle and maintains their usual unreadable expression, rarely revealing their thoughts. Despite their silence, they are a determined and reliable fighter who stands beside their friends. They are Asriel’s Younger Sibling, and the Youngest Child of Toriel and Asgore Dreemurr.

Susie appears as a Dinosaur Monster. She has yellow eyes with black pupils. Her scaled skin is lavender pink. She has long plum hair, and clawed hands. She wears a long black vest with purple trims, a sleeveless purple shirt, baggy plum pants, and black boots with golden soles. She also has two black bracelets with yellow spikes on each arm, and a black belt with a large golden heart buckle. Susie wields a massive axe. Susie is loud, stubborn, and intimidating, but beneath her rough exterior is a loyal friend who will protect her team at any cost.

Ralsei is depicted as a short Goat-like Darkner with Pink horns. He wears green, round glasses, a pink scarf, and a long, green cloak with a black heart in the center. Ralsei uses healing and magic to support his friends, believing that kindness and compassion can overcome even the greatest darkness.

Noelle appears as an anthropomorphic reindeer with short light-brown fur, a red nose, two brown antlers, and two fluffy deer ears. She's quite thin and small. Her eyes are big and have black pupils, on her eyes, she has thick, black, long eyebrows. Noelle has long, thick, platinum-blond hair. She also has a deer's tail and black hooves. She wears a long white robe with wide ample sleeves. Noelle is a talented healer and ice magic user who often doubts herself, but she becomes brave when protecting the people she cares about. She is December’s Sister, and the Youngest daughter of Rudy and Carol Holiday

Berdly resembles a large avian with blue feathers, green sclera, a yellow beak, and yellow legs.He wears a "Smart Scouter" on his head that consists of an orange tinted lens and two white and green pointed headsets. His ensemble consists of an orange cape, futuristic white armor with pointed shoulder guards, bracers and leg armor. He wears a black bodysuit underneath this armor, and has green cloth wrapped around his waist. In battle, Berdly uses a green laser halberd with a yellow ax blade. Berdly is an Egoistical Nerd, believing himself to be above others and much smarter. Beneath his ego is a loyal friend who wants to prove himself.