Sienna Shaw

Sienna Shaw is the eldest daughter of Michael and Barbara Shaw and grew up very close to her father, a troubled comic book artist whose increasingly deteriorating mental health left deep scars on the family. Before his death, Michael drew Sienna as a winged Valkyrie warrior and forged a mysterious sword that would later become a key element in her destiny. Following his death and the violent events surrounding serial killer Art the Clown, Sienna struggled to hold her fractured family together, acting as a protector and emotional support for her younger brother, Jonathan.

As the horrors surrounding Art escalated, Sienna emerged as a reluctant hero forced into extraordinary circumstances. Initially grounded in logic and denial of the supernatural, she gradually accepted the possibility that her father's visions and creations were prophetic. Wearing the Valkyrie costume inspired by her artwork, she confronted unimaginable violence and loss, enduring severe trauma while continuing to fight to protect those she loved. Her resilience, courage, and fierce loyalty to her brother defined her actions as she ultimately faced Art head-on with the enchanted sword her father left behind.

Years later, Sienna carries the lasting psychological weight of her battles, suffering from post-traumatic stress, grief, and survivor's guilt. Despite these burdens, she remains determined and unbreakable, driven by love for her family and an unwavering refusal to surrender to fear. Sienna stands as a symbol of endurance—someone shaped by trauma yet empowered by it—who continues to fight not only against supernatural evil but also against the darkness left behind in her own mind.

Five years after hers and Jonathan's battle against Art the Clown, Sienna is released from a psychiatric clinic and picked up by her uncle Greg, who takes her to his home, where he lives with his wife and Sienna's maternal aunt Jessica and their daughter Gabbie, who worships Sienna. While happy to spend quality Christmas time with her relatives, Sienna is revealed to be still experiencing post-traumatic stress disorder-induced hallucinations of her deceased best friend Brooke, who holds Sienna responsible for her death, which forces Sienna to abruptly excuse herself from the table during lunch with her family. After taking a pill of her medication, she calls Jonathan, who is now attending college, and both siblings say they miss each other dearly.

At night, Sienna and her aunt talk to each other and Jessica promises her niece things will get better before both of them start laughing as they reminisce about Sienna's mother and Jessica's sister, Barbara. Before going to bed, Sienna writes her experience with the Brooke hallucination at lunch in her journal, a book where she has been recording all of her nightmares and hallucinations throughout these last years after surviving Art's rampage.

On the next day, Sienna and Gabbie head to the mall to buy a gift for Jonathan. As Gabbie goes to look for a perfume for her father, Sienna becomes confused and slightly disturbed when the shop's music transitions from a Christmas classic song to the Clown Cafe song. Shortly afterwards, she sees a masked Santa Claus who creepily waves at her at the exit of the shop, causing Sienna to shed a tear at the possibility of her nemesis Art having risen from the grave. After this, Sienna regains her composure and takes Gabbie home before deciding to visit Jonathan at his university.

The two siblings appear to have a hard time reconnecting and Jonathan turns down Sienna's offer to spend Christmas with her and their relatives in favor of joining his classmates in a Christmas-themed frat

Biography
Sienna was born the older child and only daughter of Barbara and Michael Shaw. His brother Jonathan was born five years later.

From a young age, she was very close to her father, who would sometimes take her fishing. One day, he caught her cutting the heads off of several minnows. Over a year before her on-screen debut, her father was diagnosed with an unknown brain tumor that drove him to abuse his family, becoming particularly fixed on Sienna.

As a skilled comic book artist, he drew her in his sketchbook wearing a Valkyrie female warrior costume with angel wings, which she would eventually create for Halloween 2018. Before her death through electrocution by driving himself at full speed towards an electricity plant, he crafted a special sword for Sienna which she would later eventually use to kill Art the Clown, and seems to have supernatural abilities that are able to heal her wounds and rescue her from the dead.