Baby in yellow

Hastur is the biological son of the King in Yellow and Cassilda Blackwood.
His father, the King in Yellow, is an ancient and immensely powerful supernatural entity who rules over Carcosa. He is mysterious, authoritative and connected to the Yellow Sign and the King's Tree.
His mother, Cassilda Blackwood, is a mysterious woman who has a special connection to the King and their son. She genuinely cares about Hastur and affectionately calls him her little prince.
Unlike ordinary humans, Hastur was not born through a natural human birth. His existence began through the supernatural union of his parents.
Deep within Carcosa, near the enormous King's Tree, a special golden flower began to grow. It was unlike the other flowers produced by the tree. As time passed, the flower developed and eventually opened, revealing a tiny baby with pale skin, reddish-orange eyes and an unusually wide smile.
That baby was Hastur.
The King recognized him as his son and heir, while Cassilda lovingly accepted him as her child.
Hastur inherited his father's supernatural powers, connection to Carcosa and ability to influence the world around him. From his mother, he inherited a special connection to living beings and emotions.
Additional facts:

• Hastur is the biological son and heir of the King in Yellow.
• Cassilda is his biological mother.
• He is a supernatural being, not a human.
• His aging process is different from that of ordinary humans.
• The King's Tree is connected to his origin and reacts to his presence.
• Despite his mischievous personality, he remains deeply connected to both parents.
• The King considers him his heir, while Cassilda affectionately treats him as her little prince.

The King's Tree is a mysterious supernatural organism connected to the King in Yellow and Hastur. It is the source from which the Baby originates. Its appearance is unusual and otherworldly, resembling a strange, enormous tree with yellow maple-like leaves shaped like little crowns.
Its roots produce mysterious flowers known as Reagent Flowers. These flowers develop seeds from which new Babies can grow. The tree is deeply connected to Crown Childcare, where its creations are nurtured before being sent into the world.
The recurring yellow symbol seen throughout the game is inspired by the appearance of the King's Tree. It represents the tree's influence and its connection to Hastur and the King.
The tree is not an ordinary plant. It is a supernatural living organism with an unusual life cycle, capable of producing new beings and spreading the King's influence.

Appearance: Humans wearing long yellow robes with hoods and pale, expressionless masks.

Personality: Devoted followers of Hastur and the King. They are secretive, obedient and committed to spreading the King's influence.

Appearance: Small dolls dressed in brown, hooded robes with mysterious white patterns. Their faces are covered by miniature white plague doctor masks.

Personality: They are strange creations of Dr. Arkham. They are generally silent and mysterious, following their supernatural purpose.

Appearance: Her official physical appearance is unknown. She is represented as one of the Seekers in the group's artwork.

Personality: Very little is known about her personality. She was a researcher and member of the Seekers, studying the mysterious forces surrounding Carcosa

Appearance: Wears a blue plague doctor outfit, a blue top hat and a plague doctor mask. She also wears glasses for examining objects.

Personality: Intelligent, curious and eccentric. She was a researcher studying Carcosa and the supernatural. She was once romantically connected with Dr. Arkham.

Appearance: Her exact physical appearance has not been officially revealed. She is known through her apartment, artwork and recordings.

Personality: Originally creative, ambitious and passionate about art. However, Hastur's influence made her increasingly paranoid and unstable. She became obsessed with the King and his mysterious music.

Appearance: A small white rabbit plushie with little black eyes and a tear on its head. It also appears as a drawing with green eyes.

Personality: Helpful, mysterious and protective. It guides the Sitter through dangerous places and helps them escape Hastur.

Appearance: An ordinary-sized black cat with glowing blue eyes and a blue collar with a little bell.

Personality: Mysterious, clever, observant and seemingly helpful. She initially assists the Doctor and the Sitter, but her true loyalty is to Hastur and his cult.

Appearance: A small, light-green robot with a large head, rounded body, little arms and a hovering lower section. He has several antennas, large blue eyes and a line-shaped mouth that also works as a printer. His eyes can turn red when aggravated.

Personality: Friendly, helpful, curious and enthusiastic. He loves plants, nature and exploring. He is loyal to his companions and assists the Sitter.

Appearance: A mysterious supernatural entity associated with yellow robes, a crown-like or hooded silhouette and an unsettling, otherworldly presence. His complete appearance is not clearly revealed.

Personality: Mysterious, powerful, manipulative and ancient. He is Hastur's father and the source of the strange influence surrounding Carcosa.

Appearance: Her complete physical appearance is not shown clearly in the game. She is primarily represented through telephone conversations and recordings.

Personality: Soft-spoken, polite and seemingly caring. She calls Hastur her little prince and presents herself as his mother. However, she is secretive and willing to deceive babysitters to protect her own interests.

Appearance: A tall man wearing a yellow and light-brown plague doctor outfit. He has a long yellow coat, dark trousers, brown boots, gloves and a wide-brimmed black hat with yellow details. His face is completely hidden behind a white bird-like plague doctor mask.

Personality: Serious, cautious, intelligent and determined. He studies supernatural phenomena and wants to prevent Hastur and the King's influence from spreading. He is protective of those he considers allies.

Appearance: The playable employee of Crown Childcare. Their exact human appearance and gender are not officially established. A cultist reflection provides a glimpse of their appearance wearing a yellow cult robe and mask.

Personality: Curious, resourceful and good at solving problems. They are capable of thinking outside the box, exploring unfamiliar places and interacting with unusual objects.

Appearance: A human woman associated with Crown Childcare. Her appearance is represented through her employee and administrator design, with a professional outfit and a plague-doctor-inspired aesthetic in her Seeker history.

Personality: Intelligent, manipulative, authoritative and secretive. She is skilled at maintaining a friendly professional image while hiding her true intentions. She was formerly one of the Seekers but became aligned with Hastur's cause.

Appearance: Originally a small, pale-skinned baby with chubby cheeks, large amber-orange eyes and a yellow outfit with a crown emblem. In your AU, he has grown into a teenager. He has pale skin, black shoulder-length hair with curved ends, reddish-orange eyes and a very wide, almost permanent mischievous smile. He wears an orange buttoned shirt, brown trousers, boots and a long golden cape with a white ribbon and red jewel. His eyes become dark with fiery pupils when he experiences intense emotions.
Personality: Mischievous, playful, intelligent, unpredictable and manipulative. Loves teasing people, causing trouble and using supernatural abilities. Despite his cheerful smile, he can be intimidating and dangerous.