Delta

**Delta** is a fusion of Rozaliya Olenyeva and Liliya Olenyeva in the event *Honkai Quest*.

## Appearance

Delta resembles Rozaliya but with some key differences:

* Her pink hair has strands of Liliya’s blue.
* Her eyes are darker and are a mix of Roza’s and Lili’s colors.
* She has two horns on each side of her head: black and pink on the right, black and blue on the left.
* Her tail is black and has more of a mechanical looking tip.

All of these differences showcase that Delta is a fusion of Rozaliya and Liliya.

In terms of clothes, Delta is styled in street fashion rather than the frills Roza prefers. Her hooded coat is split by pink and blue belts down the middle. These belts connect at her chest and extend to her back. Her outfit also works as a dress, and has marks resembling crosshairs at its sides. To further represent the fusion, one side of her jacket is mostly black, and the other side is white.

Her sleeves fall off the shoulders and have pink or blue brooches to hold them up, depending on which side they're on. The spikes at the end of her dress match the belt closest to them. Her stockings also alternate, opting to match with the corresponding horn in pink or blue. Her shoes are blocky, with white soles and black tops, which extend well beyond her shins.

When Delta enters burst mode, her ponytail takes on the appearance of a 8-bit flame.

## Personality

Delta is stoic and can be standoffish at times. She completely lacks Rozaliya's childish innocence, 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 she was bubbly and energetic, but when Liliya disappeared, those traits followed.

Delta is sympathetic towards Seele’s wish to be reunited with her sister.

## History

### Before Fusion

Rozaliya and Liliya were soldiers working for Marshal Cocolia. The two underwent an experiment that would integrate Honkai Beast genes into their bodies. While Roza's procedure was a success, Lili's was less than perfect, and thus she ended up hospitalized while Roza fought on the battlefield alone.

One day, after leaving Lili's hospital room, Roza hears from the nurse that, though her sister will be discharged the following day, she won't ever be able to fight again due to long term side effects of the experiment. She explains to Roza that Marshal Cocolia has arranged for her to be enrolled at a normal school. Roza, in a fit of rage, almost chokes the nurse, but stops herself and has a nervous breakdown. She punches the floor, pulls out her hair, and laments how big of a moron she was when she spoke to Lili just a few moments prior.

An unspecified amount of time passes.

The next we see of the sisters is when they're chased by a horde of beasts that resemble Quantum Shadows. They plan to escape through the Central Avenue in an attempt to reach a secured garage with an armored car for them to use, but Roza decides to fight the beasts alone. She passes her ID Card to Lili so that she can get the car and escape. Meanwhile, Roza would buy her the time to do so.

In spite of her initial indecision, Lili carries out Roza's request and manages to drive off safely. Sometime later, Liliya and a medical team are able to find Rozaliya. She's heavily wounded, and incapable of moving or speaking due to dried blood clogging her throat. She is rushed to the hospital, and next gains consciousness on an operation table.

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

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

About 3 years later or so, Delta would go on to be recruited by an unknown organization from outside her universe and be sent on various missions. She would also go on to becoming the mentor of another duo of Olenyevas that had been wandering through the Sea of Quanta, causing mischief.

## Game Story

#### Honkai Quest

Delta saves Seele and asks if she's okay. Seele panics when she thinks Delta is drinking alcohol, but is relieved after Delta shows that she's drinking Cherry Juice. Delta finds out that Seele fell for the Tavern owner's trick. After listening to her for a bit, Seele asks her to be her adventure partner. At first, Delta rejects... but then she gets hungry. Seele gives her some bread and she relents.

At the conclusion of the event's story, Delta defeats the Dark Lord (the Quantum Shadow "Couatl: Revenant"), that possessed Seele's sister Bronya. The two are safely reunited.

#### Spring Revelry Dinner

Although she isn't a part of the Hyperion's crew, Delta knows Rita somehow, as the latter invited her to the Spring Revelry dinner.

## 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 Emperor Honkai Beast Son of Dawn and Son of Darkness respectively, Delta appears to be the equivalent of their fusion, Assaka.
* It is possible that Liliya communicates with Delta through thoughts in a similar way to how Sahā: Assaka was capable of learning Liliya's combat style by fusing with her in the main story.
* 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.