Marianna

"A song you cannot hear... destruction you cannot see... that is my ability."

Marianna, also known as Experiment 138: The Lamenting Siren, and given the title  'The Star of the Sea', is one of the experiments of the DC.

Personality
Marianna is very reserved and bashful by nature, but is also pure-hearted. She is private and soft-spoken, even amongst close friends, and seems to enjoy time alone, which she often dedicates to songwriting. She has been socially anxious and self-conscious since she was small. She also embarrasses very easily and does not easily live down mortifying moments. Due to her shyness, she doesn't talk, but her form of communication is by her notepad on which she writes out her dialogue.

Marianna is warm-hearted and in touch with her emotions, possessing a very sensitive side that reveals itself more than she would like. Marianna is very aware and expressive of her feelings, though not always intentionally, be it her appreciation of her friends or her passion for music. She also seems to have a knack for offering her friends comforting words when they are distressed. Marianna's softer side comes out in her, at times peculiar, writing and lyrics, which often feature cutesy, and overly girlish themes and lines. Her weakness is the macabre and horrific, and she can be incapacitated with fear by stories involving the supernatural, horror, and gore. She also has an irrational fear of collections of small holes.

Marianna is diligent, responsible, and sober. She is a very dedicated musician and is technically advanced at singing.

According to a lot of people, Marianna is a truly fearsome fighter, surprisingly. Marianna's notepad serves as her limiter for her powers. When she closes her notepad, she's serious about fighting. Her powers as a Siren are so great, that she was deemed a "Genius" and earned the nickname "The Star of the Sea".

Powers and Abilities
Amphibious Transformation: Merfolk are able to take on an ordinary human appearance through a metamorphosis to blend in with modern society and avoid being detected for varying lengths of time. Merfolk who gained legs and later went back into the water go through a transformation process. Mermaids in particular look like the sweet, innocent creatures of legend with their beautiful faces but the tails of fish covered in scales. They have fin-like extensions over their ears and thick scales on their human appendages. Mermaids have sharp nails in their mermaid form and spiny fins along the sides of their arms and tails. Merfolk can only transform in ocean water, proven when Marianna was pushed into a swimming pool but remained in her human-like state.

Aquatic Habitation: Water is the mermaid's domain, and when they are submerged in any body of water, they grow stronger and more powerful, being almost invincible. While out of water, they are unimpressive and make for easy targets.

Speed Swimming: A Siren's powerful and streamlined tail and huge flukes can propel them through the roughest waters with incredible speed, grace and agility with minimal restrictions to water resistance. Like a dolphin, their fins can propel them high out of the water.

Underwater Breathing: As they are part fish, mermaids can breathe underwater.

Amphibious Breathing: Like all mermaids, she can breathe indefinitely underwater due to having gills located in her cheeks and neck. When she assumes her human form, she can also breathe on land indefinitely.

Extraordinary Strength: Sirens are naturally stronger than humans.

Regeneration: Sirens possess greater regenerative capabilities than those of humans. They heal quickly from non-fatal injuries within a short period.

Sonic Scream: Sirens can emit a hypersonic blast of concussive force strong enough to shatter objects as tough as concrete.

Claws: Sirens possess sharp claws and can use them to inflict fatal wounds onto humans; their claws have only manifested when severely deprived of food or when their power had been siphoned. It is unknown if they can manifest them willingly.

Songs
March: Enhances the listeners' physical strength.

Rondo: Restrains the listeners.

Solo: Brainwashes the listeners. The brainwashed people retain their perception about other entities, but nevertheless prioritize Marianna's desire and well-being above all else. A person wearing earplugs gains immunity to this song.

Requiem: A relaxing song that has an analgesic effect.

Symphony: A vertical swing from a silver pipe with its destructive power amplified by sound waves.

Fantasia: A collection of Marianna's mother's songs sung all at once while infused with all of Marianna's remaining power. The song combines the healing effect of Requiem with the strength bolstering effect of March.

Siren Song: Sirens are able to emit a captivating singing voice that lures anyone who hears it toward the singer. Apparently those who are exposed to it have lingering side effects; the exact nature of these symptoms are as of yet not clearly defined. Eventually, the Siren Song leads the person that hears it to hallucinate seeing that mermaid everywhere and hearing their Siren Song out in the ocean. The person will then be driven into the water to find that mermaid and eventually drown. The song can be effective on anything or anyone, including men, women, and even animals.

Techniques
Star of the Sea: Marianna's signature technique that makes her one of the strongest experiments of the DC where she sends small sound waves that internally damages the opponent's body in small amounts before accumulating and would then kill them.

Silence in the Dark: Marianna takes a deep breath to gather sound waves and releases a giant sonic attack that targets an opponent's vital spot such as their arm ligaments to prevent them from moving.

Trivia

 * The name Marianna means "star of the sea" or "grace" in Latin.
 * Interestingly, she's also called 'The Star of the Sea' in-series.


 * Marianna has intense stage fright.
 * Marianna carries a notepad to communicate with others due to her voice being too powerful for a siren. The notepad is her limiter and it's noted that when she closes it and begins to speak it means that she is getting serious in a fight.
 * Despite fearing the use of her voice, Marianna has been noted to have a voice like an angel.
 * Marianna shares her experiment number with the SSS's Avery Lawrence.

Quotes

 * "Humans are to be protected and saved... I will never hurt them."
 * "Th-thank god you ar... are okay. Thank god."