A naked giant with skin the color of blueberries.

• A mysterious entity that appears suddenly at key points throughout the mansion.

• Most individuals are immortal; while they can be locked away or prevented from appearing, Sonic and his friends cannot directly defeat them.

• They relentlessly pursue and capture Sonic and the others.

• Eerie BGM plays while they are in pursuit.

Appearance

They have a humanoid appearance, but their height is nearly double that of Guest and the others, and their entire body is covered in purplish-blue skin reminiscent of blueberries.

Their heads are abnormally large, with a face like a smirking middle-aged man occupying about half of their body length.

Their beady eyes are uneven in shape and size, and this imbalance further enhances their creepiness.

• They appear without warning to track Sonic and the others.

• On the other hand, if one continues to flee for a certain amount of time, they may suddenly stop the pursuit when moving between rooms; if one returns to where the Oni just was, it will have vanished into thin air, leaving many mysteries regarding its behavior.

• There are depictions of them approaching intruders with wide-open mouths, indicating they are predators.

• They are seen preying mercilessly on any animals they encounter, not just outsiders.

• Depending on the individual, some are much slower or faster than Guest's movement speed, some suddenly accelerate from their original speed, and some remain in a single room or area for a long time.

• Once Guest or others completely escape the mansion, the pursuit ends.

• Many individuals continue to pursue as if nothing happened even after sustaining injuries that should make movement impossible, possessing a resilient life force clearly different from that of normal animals.

Its appearance is quite different from a normal Ao Oni, with a flat, board-like body, round eyes, and exposed fangs. ...Is it a piece of fish cake?

• Unlike other Ao Oni, Fuwatty has the troublesome trait of closing the distance with a high-speed dash.

• It will charge if Sonic and the others are in a straight line after moving to a new area, or it will pause for a moment and then charge after they have been running around in the same area for a while.

The fastest hedgehog in history, capable of running at the speed of sound anywhere.

• He loves freedom and hates injustice.

• He can be a bit short-tempered, but he has a kind heart and can't ignore someone in trouble.

• He views life as a series of incidents and adventures, living by his own rules rather than the rules or common sense of those around him. He always keeps his promises and never betrays others.

• Usually a mere jokester who remains aloof in any pinch, he can surprise onlookers with an intensity and sharpness that makes him seem like a different person.

Real Name: Sonic the Hedgehog Alias: Sonic Species: Hedgehog Gender: Male Height: 100cm Weight: 35kg Running Speed: Supersonic

• First person: I (casual/masculine)

• Most of his body is covered in blue fur.

• Emerald green eyes.

• He loves chili dogs.

Real name Miles Prower, commonly known as Tails. A kind-hearted young fox with two tails.

• With his mechanical skills and brilliant mind, he supports Sonic in various ways.

Real Name: Miles Prower Alias: Tails Species: Fox Gender: Male Height: 80cm Weight: 20kg Likes: Mechanics, mint candy Dislikes: Thunder, Ao Oni Special Skill: Can fly by rotating his two tails Hobbies: Tinkering with machines, piloting mechs

• Has an androgynous and cute appearance.

• Sky blue eyes.

• First person: I (polite/soft)

• Second person: You (polite) / [Name] without honorifics

• Gentle and relatively introverted.

Appearance

His fur is mainly amber, with white shading on the muzzle, cheek tufts, belly, and tail tips.

He has large triangular ears with white grooves on top, a small black nose, and three tufts of hair on his forehead.

He wears white gloves with open cuffs, white socks, and red shoes with white toes.

"Leave it to me!"

A wild and powerful echidna.

• Sonic's friendly rival.

• Because of his straightforward and serious personality, he can be easily deceived.

• A master of martial arts who also possesses the skills of a first-class treasure hunter.

• His fist power is intense, and his punches can shatter rocks.

Real Name: Knuckles the Echidna Alias: Knuckles Species: Echidna Gender: Male Height: 110cm Weight: 40kg Likes: Fruit (especially grapes) Dislikes: Strong sunlight, Ao Oni Special Skills: Digging, wall climbing, gliding, punching

• An anthropomorphic echidna character.

• Purple eyes.

• An echidna characterized by bright red fur.

• While he is impulsive and short-tempered, he has a kind and pure heart at his core.

Appearance

He has a black nose at the tip of his muzzle, a white crescent-shaped fur patch on his chest, and sharp teeth.

He has seven dreadlock-like spines on the sides and back of his head and a medium-sized tail with three bends.

His attire consists of red and yellow shoes with green cuffs, light gray soles, and plates secured by six metal bolts on top.

He wears large white mitten-like gloves with sock-like cuffs and spiked knuckles on both hands.

"L-Leave it to me!"