Firefly Diary Doll Brand Introduction
Firefly Diary Doll（YH Doll） is an emerging brand founded in 2023, backed by a production team with extensive industry experience and refined craftsmanship. The team infuses delicate emotional expression and imaginative creative concepts into every detail, striving to create dolls that feel alive—each with its own sense of “soul” and vivid presence.
Inspired by a school-themed universe, every Firefly Diary Doll is designed as an independent character from a campus setting, complete with its own background, personality, and storyline. The brand adopts a distinctive 2.5D artistic style, which skillfully blends the expressive charm of 2D animation with the realistic textures of 3D realism. This approach allows each character to retain an animated, expressive quality while preserving rich, lifelike details.
It is precisely this strong thematic identity and unique artistic direction that has drawn widespread attention and interest since Firefly Diary Doll’s debut.
Firefly Diary Doll Authorization
Brand Features
Head
The head designs of Firefly Diary Doll primarily feature Japanese-Asian inspired facial aesthetics, while the brand has also developed several Western-style heads, as well as one male head, catering to diverse tastes and character requirements.
Each head is crafted in a unique 2.5D artistic style, skillfully blending the expressive charm of 2D animation with the dimensional realism of 3D modeling. This design approach gives each character a visually lifelike yet dreamlike quality. Not only does it highlight the doll’s personality and appeal, but it also conveys distinct emotions and unique charisma, ensuring that every Firefly Diary Doll is imbued with vivid soul and visual allure.
Asian Series Head Designs:
Western Series Head Designs:
Male Doll Head Designs:
Body
Height📐:
● Female Dolls: 151 cm to 165 cm
● Male Dolls: 175 cm to 180 cm
Body Type⏳:
● Female Dolls: Predominantly hourglass figures
● Male Dolls: Muscular build
Bust Size🍑:
● Dolls available from cup size A to G
Body Measurements Illustration:
---------------Featured Bodies---------------
1.Max Series
The Max Series is Firefly Diary Doll’s premium line. This series features highly realistic bodies with an authentic look and a lifelike, soft touch.
Touch & Feel:
● Dual-Layer Replication Technology: The Max Series bodies are constructed with a dual-layer structure. The outer layer replicates the delicate texture of real skin, while the inner layer simulates the softness and elasticity of subcutaneous fat, resulting in a touch that closely mimics a real human body.
● Imported Platinum Silicone: Enhanced softness, offering a bouncy, lifelike touch that closely mimics real human skin.
● Graduated Softness Design: The body features varied firmness across different areas—softer at the chest and hips, with firmer support at the waist.
Appearance:
● Skin Texture: The surface features finely detailed skin textures, making both the look and feel more realistic.
● Breathable Body Makeup: The Max Series adopts the “Super Artisan Makeup”, featuring 8 + 8 layers of fully hand-painted body makeup.
Specialized coloring methods are used to create natural skin tones around veins, joints, and other detailed areas, delivering a highly realistic experience both visually and to the touch.
Other Highlights:
● Upgraded Toe Skeleton: Articulated toes allow natural movement, creating more lifelike poses whether paired with high heels or barefoot looks.
● Ball Joints: Enhanced flexibility at the wrists and ankles allows for a wide range of natural, realistic poses.
Features
The head designs of Firefly Diary Doll adopt a distinctive 2.5D artistic style, seamlessly blending the expressive beauty of 2D animation with the dimensional structure of 3D realism. This approach creates a delicate balance between reality and fantasy, allowing each character to exist gracefully between the two. Refined facial details and soft, layered contours give every face warmth and emotion, as if each expression is capable of conveying an inner world of feelings.
At the same time, Firefly Diary Doll goes beyond visual design by crafting a unique and complete backstory for every doll. Each character is no longer a static figure, but a presence with its own personality, experiences, and emotions—inviting players and collectors to form a deeper emotional connection that extends beyond appearance alone.
It is this creative philosophy—where artistic style and character storytelling are brought together—that defines the distinctive identity of Firefly Diary Doll, ensuring that every creation feels vivid, expressive, and truly alive.
Firefly Diary Doll Options & Functions
Material Options
Firefly Diary Doll offers both full silicone dolls and hybrid dolls (silicone head with TPE body).
---------------Silicone---------------
Firefly Diary Doll primarily produces silicone dolls.
Silicone dolls are widely praised for their highly realistic texture and stable physical properties. Compared to other materials, silicone has higher density and toughness, a smooth and delicate touch, and superior detail rendering, allowing it to accurately showcase skin texture, facial contours, and body lines.
In addition, silicone excels in durability and structural stability, making it resistant to deformation and ensuring that the doll maintains a good appearance even after long-term use.
Silicone Doll Display:
---------------TPE---------------
The TPE bodies offered by Firefly Diary Doll are made from STPE, an advanced composite material that builds upon traditional TPE. It combines a soft, delicate touch with superior durability. STPE excels in elasticity, resilience, and structural stability, providing a comfortable feel while enhancing overall usability and long-term performance. In addition, it produces less surface oil, making daily maintenance and care easier.
TPE Doll Display:
STPE VS. TPE:
---------------Soft Body Option---------------
Targeted Softening (e.g., abdomen/thighs) involves removing the weight-reducing layers in specific areas and replacing them with softening gel. This creates a localized soft, realistic feel, although it may add some extra weight to those regions.
Gel Hip Display:
Abdomen & Thigh Softening Display:
---------------Hard Hands & Hard Feet---------------
Both hard hands and hard feet are made from firmer silicone, enhancing durability, shape retention, and long-term stability.
● Hard Hands: Effectively preserve the details and textures of the hands, keeping the fingers from deforming or penetrating, ideal for users who frequently manipulate the doll’s hands.
● Hard Feet: Reinforce the weight-bearing capability of the soles, allowing the doll to stand steadily without metal bolts, ensuring stable poses.
Firefly Diary Doll has also improved the transition between hard hands, hard feet, and the body, creating a smoother connection without obvious seams for a more natural appearance.
Skeleton
---------------EVO Skeleton---------------
The EVO Skeleton features a movable joint at the clavicle for more flexible and natural shoulder movement. Double-joint structures are used at the elbows, knees, and hips, significantly increasing the range and stability of limb bending. This allows for more precise, multi-angle dynamic poses while maintaining a balance between realism and playability.
Skeleton Movement Display:
---------------Fully Loose Joint Skeleton---------------
The Fully Loose Joint Skeleton has nearly frictionless joints, which means it cannot support standing or posed positions. When you lift a leg and release it, it will fall freely.
Fully Loose Joint Skeleton Display:
---------------Finger Skeleton---------------
1.Wire Finger Skeleton
This skeleton uses flexible wire as the structural framework, allowing for simple finger bending poses. However, it lacks individual finger joints, so it cannot achieve precise or highly flexible finger movements.
2.Articulated Finger Skeleto
Firefly Diary Doll employs an upgraded Articulated Finger Skeleton. Based on the original multi-segment metal hinge structure, this skeleton has been comprehensively optimized. Each finger can still bend and hold its shape independently, enabling natural gestures and intricate poses.
The overall skeleton features a reinforced cylindrical design for greater stability and durability. The fingertips are equipped with ball-shaped structures to prevent penetration and improve wear resistance. A ball joint has been added to the wrist, increasing flexibility and allowing for more complex poses in combination with finger movements.
The internal metal skeleton is coated with a flocking finish, which reduces friction noise, ensures smooth and natural finger bending, and minimizes wear on the outer skin material, extending overall lifespan. Compared to traditional wire fingers, the upgraded articulated skeleton offers significant improvements in stability, durability, and motion performance, providing a reliable foundation for hand manipulation.
---------------Toe Skeleton---------------
Firefly Diary Doll offers an optional metal wire toe skeleton. The toes can be easily bent to achieve natural poses while providing additional support to the feet, keeping them stable and preventing sagging or deformation. This also makes wearing socks and shoes more convenient.
Skin Color Options
Firefly Diary Doll offers three skin tone options: Fair, Tanned, and Dark.
Head Type Options
Firefly Diary Doll offers both Soft Silicone Heads and Hard Silicone Heads.
● Hard Silicone Heads: Made from firmer silicone, these heads usually do not include an oral cavity, but feature more refined facial details and skin textures. They support rooted hair and come with implanted eyebrows and eyelashes.
● Soft Silicone Heads: Made from softer silicone, these heads have painted eyebrows and applied eyelashes. Facial details are slightly less defined compared to hard silicone heads. Soft silicone heads are available with or without an oral cavity option.
Hard Silicone Head vs. Soft Silicone Head:
ROS Function
Firefly Diary Doll offers the ROS (Real Oral Structure) option for both soft and hard silicone heads. ROS includes teeth, tongue, internal oral textures, and a movable lower jaw, allowing the doll’s mouth to open, close, or stay partially open, providing a more realistic experience.
ROS Function Display:
Hard Silicone Head With ROS Function:
Soft Silicone Head With ROS Function:
Oral Sucking Function
The oral sucking function simulates the dynamic behavior of a real human mouth during interaction using a pneumatic system, including gentle suction, subtle contractions, and natural breathing rhythms.
Oral Sucking Function Display:
Eye Options
Handcrafted resin eyes are the standard for all Firefly Diary Dolls. Made entirely by hand, these eyes offer excellent light transmission, reflecting more light to create a lifelike, expressive gaze that brings the doll to life.
Vaginal Options
---------------Vaginal Type Options---------------
Firefly Diary Doll offers both fixed and removable vaginal options.
Click here to learn more about vaginal types
---------------Vaginal Texture Options---------------
Firefly Diary Doll offers five vaginal texture options.
---------------Vaginal Size Options---------------
Firefly Diary Doll offers vaginal length options ranging from 10 cm to 18 cm.
Penis Options
---------------Penis Type Options---------------
Firefly Diary Doll offers both soft and hard penis options.
---------------Penis Length Options---------------
Firefly Diary Doll offers four penis length options.
Auto Sucking Vagina Function
The Auto Sucking Vagina Function uses an internal pneumatic system to simulate the contraction and suction of a real human vagina. The internal canal produces squeezing and suction effects according to preset rhythms, providing a more lifelike and interactive experience.
Auto Sucking Vagina Function Display：
Heating Function
Heating Function Display：
1.Silicone has excellent heat insulation, so it takes longer for warmth to transfer to the skin and body. On average, the doll takes about 2 hours to reach full warmth.
2.Do not leave the doll unattended while using the heating function.
3.Avoid prolonged heating to prevent damage to the doll.
Moaning Function
Firefly Diary Doll features a five-point touch-activated sound system, with sensitive sound chips embedded in areas such as the chest, abdomen, and hips. The intensity and rhythm of the moaning sounds adjust dynamically based on the pressure applied, delivering a realistic sensory experience.
Moaning Function Display：
Weight Reduction Technology
Weight-reduction technology is the default option for Firefly Diary Doll silicone dolls. It uses built-in weight-reducing layers to lighten the overall doll weight.
Firefly Diary Doll Factory Photos
