Delta

Name: Delta - initially the project name for the fusion, now a way for her to pay respect to her fuses twin sister who was subsumed and lost in the merger of their bodies.

Primary Consciousness: Rozaliya Olenyeva Subsumed Consciousness: Liliya Olenyeva

Birthplace: Siberia Race: Human (Formally), now Merger of Rozaliya and Liliya. Gender: Female Age: 16. Body: Petite but normal for their age. Breasts: A-cup. Hair: Either pig tails or letting it flow down to her waist, depends on mood. Status: Alive, Fused with Twin Sister's body. Occupation: None, wandering the streets, homeless, merc for hire, clearing monster if she encounters any.

Voice: It's mainly Rosaliya's but far more mature, like she's seen a lot of bad things type of vibe but otherwise a normal girl's sweet voice but with lower energy.

Colors: Rosaliya used to love pink and white while Liliya used to love Blue and black. Styling their outfits, hair, horns and tails with them. Delta as a merger of the both use all of these colors in a roughly symmetric manner. One horn blue the other pink, half of the outfit pink and white while the other black and blue... The same goes for her hair and so on. But as Liliya is subsumed by Rosaliya. There is a slight asymmetry where Pink and White is more dominant in some places. Delta loves to use neon lights and highly saturated colors to somewhat make distinct from the both of them who used to have more matte colors.

Outfit: Both girls used to wear body fit outfits with lots of frills, not wearing any undergarments as the outfit itself forms their panties and bra. It was quite revealing but not too much as it's mainly designed to help them in combat, the dress part of their bodies and to give an opening for their quite large tails. Delta's outfit reflect this with black panties that look like it's about to fall off and other details. However she wears a semi-transparent coat over it that hides most of her body while still revealing hints of her form underneath. She may also chose to wear a shorter version where it acts like a skirt giving a clear access to her butt. These types of outfits are ordinary for girls like her and won't even make an attempt to point it out, and it does cover her up enough to be okay.

Twin's tails have a gripper of the girl's favorite color with 3 fingers. It is strong as one of their arms. Post fusion Delta got Liliya's tail, the only part of the Delta's body that Liliya's mind have control over. Delta can use her tail to hold one of her two great swords while fighting, something both sisters were trained to do before they were merged.

Personality: Delta tends to have a slightly depressive or low energy but is willing to take action and is energetic when she wants to. She focus on her tasks to stop her mind from wandering off making her look more determined than what she actually is. Never going off topic and answering questions straight forward like how Liliya is but still being kind slightly more human as Rosaliya used to be. She tends to be socially distant and on point whenever talking to someone, almost like she is busy and needs to get away from them.

Delta tries really hard not to bring up the topic of her former self Rosaliya and twin sister Liliya or their fusion whenever she can get away with it as it brings bad memories for her which she'd rather avoid and move on with life.

Delta is stoic and can be standoffish at times. She completely lacks Rozaliya's childish innocence and energetic nature, and is somewhat cold to others. With friends she is more casual, but she isn't willing to tolerate people getting too close to her. She also loathes being treated like a child based on appearances alone.

She is rather secretive about her past, but clearly carries trauma from losing Liliya. She seems to have some form of guilt for being unable to protect her little sister. In the past Rosaliya was bubbly and energetic while Liliya was the quite one who is always low on energy.

When Liliya disappeared, both girl's minds seem to have merged somewhat as well, Rosaliya's energy is gone, Liliya's quiteness is also no more. Delta is a true fusion of the two, falling somewhere in the middle.

Trivia:

• Delta suffers from a form of Post-Traumatic Stress Disorder that is triggered whenever she falls asleep. In her dreams she always re-experiences the day she almost died in the freezing snow. For this reason Delta avoids falling into deep sleep. When triggered, the stress increases her Hypersensitivity and the symptoms associated with it.

• Delta has a scar on her left shoulder: a wound from that day.

• Since Rozaliya and Liliya have been genetically modified with the genes of the two strong monsters who can fuse their bodies to create a even stronger single entity, Delta appears to be the equivalent of their fusion.

• It is possible that Liliya communicates with Delta through thoughts in a similar way to how the monsters are capable of merging each other's thoughts along with their form for even greater combat powers.

• Delta's weapons are named Sleeper's Dream and Odette the Silent. The weapons' names both originate from the characters of two famous Ballets: Sleeping Beauty and Swan Lake. One is Rosaliya's great sword, the other is Liliya's.

Backstory: Rozaliya is Elder twin sister of Liliya in her Bubble Universe. after "Monsters" appear in her world she with her Twin Sister join the military , after some time in the military Rozaliya get to the rank of Lieutenant, Rozaliya and Liliya are inducted into an Experiment.

The experiment was to give the girl's the monster's power, it manifested by giving them a strong tail that can act as an extra appendage and horns. Along with strength that allows them to wield powerful great swords and control their powers to fight the monsters.

The experiment was successful to Rozaliya, but failed to Liliya then she was hospitalized in st. Freya. For the 297 days after the Experiment Rozaliya keep visiting Liliya in the Hospital. Rozaliya keep telling stories and give book to her sister, she also telling her to get better soon so they can fight monsters together again. Rozaliya was angry and shocked when the nurse tell her about Liliya condition. As Liliya could never fight again, she regret saying she want to fight alongside Liliya again.

After unknown time, Rozaliya and Liliya are being chased by monsters while running into evacuation site, while running Liliya fell down because of exhaustion. Rozaliya then protecting Liliya from the monsters. She then telling Liliya to leave her behind as Liliya is a powerless against the monsters and she said it was Elder sister job to protect her little sister. After Liliya left, Rozaliya is badly injured after fighting with the monsters as she was regretting what she said to Liliya before she left and being a terrible big sister to her. Then she was angry and shocked after seeing Liliya come back to her after getting reinforcement. Rozaliya wanted to yell but blood clogged her throat. she couldn't make a sound then passed out.

She is unable to speak or move, but gradually comes to notice that as her sister is holding her hand. A doctor's voice fills the empty room, reminding Lili that the choice for her to fuse with Roza is going to be done without her sister's consent. Liliya urges the doctor to continue anyway, and justifies her action by stating that, while Roza believes that it's the duty of the elder sibling to protect the younger sibling, she believes that it should apply to both sides.

The procedure begins and as Roza falls unconscious while Lili holds her hand tightly. Project Delta thus starts.

Project Delta (Quote): "One day, the swan lake went quiet and the sleeping beauty woke up from her nightmares... She had no other choice but to embark on a long and lonesome journey... Her name is... Delta."

Following the operation, the resulted fusion would go on to be studied and documented for results and side effects. Rozaliya ended up as the dominant mind of the body whereas Liliya could seemingly only control the tail.

The loss of her sister made a serious side to Rozaliya's personality surface. She forsook her name and assumes the codename Delta, as a way to honor her sister's sacrifice.

In the days that followed, a postoperative pseudo-rejection reaction was documented to cause Roza fever, vomiting, and frequent episodes of skin irritation and shock. In an instance of cognitive disturbance, Roza "painted" the walls with an invisible substance, claiming to be preparing her ward for tours. This made her symptoms slightly recede.

Further study of the substance revealed it to be comprised of Honkai-infused antibodies that are dangerous to biologic tissues. It was concluded that the pseudo-rejection reaction is a form of hypersensitivity (a disease that causes the Immune System to go overboard). All attempted treatment had subpar results.

A "pigment" substance that changes color in response to emotional fluctuations was suited into Delta's weapons as a way for her to release and weaponize the antibodies through combat.