Firefly, originally designated AR-26710, is a playable character in Honkai: Star Rail.

A member of the Stellaron Hunters and a young girl clad in a mechanical armor "SAM."

Born as a weapon, she's afflicted with the agony of Entropy Loss Syndrome due to genetic modification. She joined the Stellaron Hunters in search of the meaning of life, relentlessly pursuing ways to defy fateFirefly is a young woman with long, silvery-blonde hair with a teal ombre that reaches her waist, very fair skin, and eyes that are a mix of deep ocean blue and sunset pink.

She wears a brown blazer over a green and white dress with a yellow bow tied in the front. Her sleeves are detached and about wrist length, held with black bracelets — right side with a white flower decoration while the left is plain. She also wears a brown headband with a black bow on the left side of her head that she tore from a flag on the battlefield, along with two green feathers. On her legs she wears thigh-high stockings that fade from teal to a dark brown from top to bottom. The tops of the stockings are lined with gold, and her footwear consists of black heels with a base of white, as well as a pair of green gems in the center along with teal, ruffled collars that wrap around her ankles.A member of the Stellaron Hunters, clad in a set of mechanized armor known as "SAM." Her character is marked by unwavering loyalty and steely resolve. Engineered as a weapon against the Swarm, she experiences accelerated growth, but a tragically shortened lifespan. She joined the Stellaron Hunters in a quest for a chance at "life," seeking to defy her fated demise.Within the transparent incubation pod, she lay submerged in frigid artificial amniotic fluid, enclosed in a pristine white egg. As the container trembled, she floated, and instinctively reached the cold and soft edges. She presses against the pod's walls tightly, curled up in a corner, as if that would make her body feel warmer.

She heard something heavy fall and the clamor of metal clashing. Intermittent haste-filled footsteps resounded, and the incubator started to shake... "Warriors, it is time to awaken..." "For Her Majesty..." A pair of mechanical hands scooped her up as blinding light rent the world asunder. She forgot to weep.Feel glory in your birth..." "For Her Majesty..." She opened her eyes, yet failed to find the speaker. She rose up and advanced through heavy curtains, venturing deeper into the palace. "Accept your honor, and your destiny..." "For Her Majesty..." The cadence of footsteps in unison reverberated through the desolate palace.

She traversed the unattended vast garden, navigating through colossal insectoid carcasses and numerous incubators... until finally, she arrived at the resplendent council chamber, where a woman with a blurry face was seated upon the throne, her hands hanging wearily.The cadence of footsteps in unison reverberated through the desolate palace.

She traversed the unattended vast garden, navigating through colossal insectoid carcasses and numerous incubators... until finally, she arrived at the resplendent council chamber, where a woman with a blurry face was seated upon the throne, her hands hanging wearily.

"Don't look up." Someone approached her, whispering softly. The person bore an identification tag, AR-26702. What does that signify? She glanced at herself, AR-26710. "Come closer... my child..." A distant voice emanated from the depths of her mind, casting an inexplicable frenzy upon her consciousness. She obediently approached the Empress and knelt down, kissing her fingertips.The Empress's touch felt as icy and unyielding as solid ice, momentarily stirring a flicker of perplexity amidst her frenzy. "Ignite yourself to the last moment, for the future of Glamoth..." "For Your Majesty..."As time passed, she had grown accustomed to the battlefield. She witnessed her comrades fall before her eyes, yet she remained resolute, pressing forward. She knew that one day, she too, would meet her end on the battlefield, paving the way for those who would follow unblinkingly. Thus, moments of rest held immense value for her. She lifted her gaze toward the sea of stars hanging high above, its radiance cascading down upon her.

Tranquility pervaded everything under the starry sky. Despite the looming threat of entropy loss, she yearned to shed her battle armor and catch a glimpse of the world's true nature. The voices from memory gradually resurface. "Just looking through the lens makes the whole world feel different."Her designation is AR-214, and she wears "glasses." "Glamoth Military Regulation Article 8: Surviving knights should actively return to base." — She is AR-1368, a very austere character. There is a red ribbon on her armor. "I hope to see the stars on the next battlefield." — AR-53935, he is a "different type." "Welcome back, everyone!" — AR-4077, though she has never met him, she knew he never goes to the battlefield, always staying in the rear.

From the depths of the starry expanse, the immense insects ascended. Its abrupt invasion interrupted their brief respite. Reactivating her armor, she was ready to charge into the fray. However, the offense exhibited unprecedented ferocity. "No, this is not an ordinary attack! It's the Swarm... the Swarm!"The voices in her comms trembled as more and more of the Iron Cavalry soared to the sky like sparkling fire, only to be swallowed by the encroaching darkness as soon as they ignited. "Hold the line! Push forward!"

In her line of sight, countless numbers of the Iron Cavalry fell. Are there any of them that have spoken to her? It was a realization that struck her for the first time. So... each person is unique?

Finally, an opening was created within the Swarm, and from it emerged the Swarm Mother, advancing slowly. Like a streak of light, she skillfully navigated through the dense swarm, racing alongside her fellow Iron Cavalry comrades towardthe mouthpiece of the towering Silver Sting. Just as the Swarm Mother was about to devour her, she closed her eyes, detonating a bomb with enough firepower to obliterate an entire planet.

A blinding light erupted, engulfing the Swarm Mother, plunging everything into silence. Like a kite severed from its string, she was propelled by the tremendous impact, descending toward the ground. Fleeting memories that she would never forget flickered before her eyes...

Beside the lake where fyreflies danced, she shed her armor, relishing the refreshing breeze and coolness of the night. She observed fyreflies alighted on the back of her hand, their wings gracefully fluttering....Despite their tiny size, they shine brighter than the stars at night."

Darkness enveloped her. The remnants of the Swarm and her shattered armor disintegrated, dissipating like silent snowfall across the universe.When she regained consciousness from her coma, she found herself in an unfamiliar galaxy.

Luminescent cosmic plankton were drawn to her, swirling and dancing around her. She watched as they dispersed into the distance, unaware of where her journey would lead. "For what do we die?" "For what do we live?" The concept of a "dream" remained elusive as she stared into the boundless darkness, grappling with the search for answers.And thus, the Republic of Glamoth met its downfall, leaving behind mere rumors about the Iron Cavalries." She became alert as she realized that something had taken possession of her armor. "All Iron Cavalries were genetically engineered babies to ensure control over the Republic's most powerful weapon. They each carried a predetermined genetic defect that would accelerate their aging at a certain spot of their life, leading to their premature death..." As the footsteps drew nearer, the woman's voice grew clearer. "A predetermined fate... much like ours, wouldn't you agree?" The door of the cabin opened. Flames enveloped her body as her Molten Knight armor materialized. "Who are you?" The woman before her smiled, as if they were old friends reuniting after a long time. "Do you believe in fate? Those who walkin the same direction will eventually find their peers, and now... here we meet."Another tranquil night unfolded. As she often did, she sat in silence on higher ground, observing the flickering lights. Countless ships gracefully entered and departed the harbor until the break of dawn.

Silver Wolf yawned and walked to her. "Can't sleep?" She moved away to make some room. "Yeah, I had a weird dream about Punklorde being invaded by cyberdemons. So I kept running around, sticking those viruses with my bubblegum, and then I woke up." "A dream..." "Leaving for Penacony?" "Yes. Perhaps there... I'll find my own dream." "But for someone who can't dream at all, the pain caused by entering the Synesthesia Dreamscape is more terrible than death." "Yeah, I know. My consciousness will becrushed by the weight of memoria and then get reconstructed in a peculiar manner. This is the only way for me to enter the land of dreams... However, death doesn't frighten me, as I've grown used to it." "...Hmm, fine. Wish you best of luck. And don't forget to say hello to the Express Crew for me." ...

She arrived at the periphery of Asdana. The ocean of memoria churned with colossal waves, threatening to eradicate her like a fleeting spark ready to go out anytime in the tempest. With a swift leap, she plunged into the Memory Zone. The immense pressure closed in from all sides, causing her vision to blur, and she uncontrollably descended into the depths of the Memory Zone.Emotions concealed within the dense memoria became ethereal specters, haunting and whispering in her ears. ..."Ignite yourself to the last moment, for the future of Glamoth..." ..."For Her Majesty..." ..."Though they are but specks, they shine brighter than the stars at night..." ..."For what do we die?" ..."For what do we live?" ... After an indeterminate period of time, the raging memoria subsided. Opening her eyes, she saw Penacony in front of her eyes, glowing like a radiant pearl and glistening with a misty aura, while tears streamed down her cheeks... "Is this... a dream?".Character Introduction Aidonia, the snowy land that respects and worships death, has already sunken into sweet slumber. O Castorice, daughter of the River of Souls, the Chrysos Heir in search of the Coreflame of "Death," set forth! Guard the lament of the souls in this world, and embrace the solitude of destiny. — Life and death is a journey. When a butterfly rests on that dead branch, the withered will be reborn again.Castorice has the appearance of a young woman with pale skin, bright lilac eyes, pointed ears, and lavender, thigh-length hair styled into the shape of a ribcage which ends in two long ponytails. Her hair is adorned with multiple accessories, including dark purple butterfly clips, a purple ribbon on her left side, white bows at the ends of her ponytails, and a black, lavender gem-embedded crown and flowers atop her head.

Her outfit consists of a white and purple sleeveless dress, a purple and white frilled choker, asymmetrical purple gloves, and butterfly patterned, thigh-length white stockings attached with a garter belt. The style of the upper part of her dress is reminiscent of bones and bandages, with white, bone-like markings seemingly attached to her skin near her collarbone and a light purple ribbon at the center of her chest. Thelower section of her dress is short in the front and long in the back, split down the middle as it fades into a deeper purple with some of the frilled edges appearing charred. There is also a thin, long white strip of fabric on her right side adorned with white bows. The glove on her left arm reaches just past her elbow and ends in a butterfly design, while the glove on her right ends at her wrist and is decorated in white frills and a black decoration similar to her crown. Much of her overall outfit is embellished with butterfly and flower accessories, including on her choker, chest, upper right arm, right thigh, and heeled shoes.Aidonia, the snowy land that respects and worships death, has already sunken into sweet slumber. O Castorice, daughter of the River of Souls, the Chrysos Heir in search of the Coreflame of "Death," set forth! Guard the lament of the souls in this world, and embrace the solitude of destiny. — Life and death is a journey. When a butterfly rests on that dead branch, the withered will be reborn again.From the day she gained memory, Aidonia's snow had always been there. It was as if time had been frozen in this forlorn white ground. When she was a child, she once asked Amunet what is snow. Amunet said snow is the joy of reunion and sorrow of parting.

She was always in a trance as she stared at the people in the city. The short knight came for training in front of the temple doors every day. The middle-aged priest occasionally dozed off under her high tower. The ascetic scholars distributed Antila flower biscuits to the children. The children pushed and shoved as they engaged in a snowball fight in the distance, their laughter falling to her heart like ripe fruits. From the tower, she tried but failed to differentiate their faces.Until they were standing at death's door — the short knight suffered grievous wounds in battle, the middle-aged priest suffered from years of illness, and the ascetic scholar was infected by the patients they treated. At that moment, she was the closest to them. Life was no longer an agonizing struggle, but turning at her fingertips into flower petals in the wind. When she finally had the chance to look at their faces, she turned away instead, for she could not bear to look.

"Some hands were born to sow plants, some were born to govern... Yours carrying out the fated duty of parting." Amunet's words echoed in her ears. She once wondered what her hands could possibly leave behind.When she came to her senses, she was looking at an incomplete ice sculpture in her hands — Young warriors wielding their weapons, mothers embracing their children who were going to war, couples that cradled each other's faces with longing... Those people are no longer around. But this sort of thing will still happen again and again in the land covered by the snowstorm... and lands beyond the snowstorm.

She finally understood that even the snow in Aidonia will melt, just as everything must walk into Death's embrace.

"Nikolaos who loved to smile, the kind Ilana And Crito, who was as silent as the wind... At night, I held up those Forgotten names and forlorn memories, And turned the sorrows of the day into the boiling heat immersed in snow. ..."A poem titled "Aidonia" written by the girlDeath is an unavoidable inevitability," "Death is a warrior's honor," "Death is merely a walk out of time." On that arduous journey, she heard plenty of discussions, some direct, some poetic. Yet, these answers were like a breeze that blew over the water surface, never reaching the depths of her heart.

"Then... someone said, that dawn enveloped the holy city's overflowing hope, perhaps there, I can also..." The girl hesitated. "Don't worry, it's fine if you don't want to talk about it now. Okhema welcomes you!"The red-haired girl served her a cup of hot tea. The golden-haired lady examined the girl's gloves with interest— "Such aesthetically designed accessory, did you also learn to make it during your travels?" She shyly interlocked her fingers. "Yes, I wanted... farewells to be more formal."The sunlight in Okhema was parching and radiant, the unending announcement from the Dawn Device promised endless tomorrows.

Starting from that small cabin, she carefully began her second life. The originally empty room was decorated with bits and pieces of her daily life, felt plush toys, chimera pillows, and thick collections of poems. They were no longer symbols of tragedies, but gifts, memorials, and blessings— The habits she once had for the dead were able to give birth to warmth and strength for the first time, under Okhema's sunlight.

"The scenery outside this window always looks the same. Brilliant sunlight, gentle ripples. I blew off the snow on my hands, so that they wouldn't be too cold, for spring was far too near.Written by a girl, a poem titled "Spring"She knew her destination was not the same as her Flame-Chase companions, but she gradually began to find her own fleeting moments of warmth. As the golden thread gently guided her, she clumsily danced with others for the first time. In that garden teeming with life, she made fresh dried flowers together with Hyacine. And on the day she graduated from the Grove, sunlight draped over her dress, casting scattered shadows that resembled butterfly wings...Those moments that may seem insignificant to others were already firewood for her to live through her lonely and cold years. She craved warmth so much, but also contained her anticipation. Perhaps it was because the Flame-Chase Journey is filled with continuous loss, or perhaps because she didn't want to experience cruel misery... Just like that nightmare that had clung to her for the longest time, repeating itself again and again—

The sun set in Kephale's palm, the blood-colored dusk engulfed the dawn of the holy city. The black tide surged, and in the dead silent bath, the Weaver of Gold embraced her for the first time. Only the weaver's tired sigh remained in the sea of flowers. "My 'love' will not vanish because of death."See you tomorrow, Cas~" The shabby messenger turned into a plush toy and collapsed in her arms, barely breathing. She tried to grasp those scattering petals, but that agile thief caught her hand, giving her the last reward. "Do me a favor, just this once. So what if we cheat death?" The sky priest lowered her eyes and disappeared as she leaned on the girl's shoulder. The blood-soaked crown prince closed his eyes and awaited her execution. The warrior wept tears of blood, his armor broken. The sage from the Grove smiled and invited her to be the final witness. At the end of the dream, she saw an interstellar visitor kneel and fall over under the starry sky, proving her most terrifying assumption...Cassie, get a bit more rest." In the Twilight Courtyard's hypnosis treatment room, the doctor's eyes were filled with concern. She wiped off the sweat on her forehead as if she had made a determined decision. "No. I'll do everything I can, so that nightmare won't ever come true..."

"The Flame-Chasing heroes initially walked different paths We were attracted to each other because of our weak lights. Like moths that endured searing pain We do not fly forth because we see hope But because we only see hope when we flew ..."

— A poem titled "Flame-Chase" written by the girlMaybe... this will be my last day in Okhema." At the end of a bitter journey, she finally found the clues about the nether realm. Before she headed to the place of no return, she wanted to look carefully at the world again.

That was the Chrysos Heir's bath. She remembered how Aglaea once, in the thick steam, gave her a pair of gloves that she had carefully fixed. "Cas, you've changed quite a lot, compared to the first time we met." She touched the beautiful patterns on the gloves in surprise, and the usually indifferent leader smiled as she winked at her. "Even the present me can see your scorching heart beneath the frigid cold..."That was the serene garden behind the house, shaped like how it looked in her dreams. In that chaotic dream, she often met her other self. They tilled and nurtured the garden together, until the barren soil transformed into a lush ocean of flowers. "I wish that I can still sow seeds of hope like this in the future." That was the monument she erected for the lives once lost at her fingertips. From the deceased in Aidonia, to the Chrysos Heirs in the Flame-Chase Journey... Over a thousand years, she tried to remember everyone's name and past. "If someone still remembers, they are not truly dead."That was where she first met Trailblazer. Encounters are such miraculous things, she thought. The streets that she was so familiar with in the past had gained a special meaning because of someone else. "My lady, with my own hands, I will definitely bring you..."

As the Entry Hour draws near, the time for the promised departure is also nigh. Under the blazing sunlight, she made her first and last wish: With the freezing and arduous life as a beginning, she will write with (him/her)—

A poem titled "Castorice," which ends with a true embrace.

Firefly and Castorice wander through the penacony searching for Caelus.