Yae Tsukiko

Yae Tsukiko, previously known as Subject 157, is a teaching assistant at U.A. High School. She acts as an aid for both the teachers and students.

Appearance
Yae is a short, pale young woman with a curvy figure. She has lavender eyes and silver hair worn in a low braid thrown over her shoulder and reaching down to her hips.

She wears a white button-up under a tan long-sleeved cardigan and tucked into a long, white pleated skirt. She adds white flats and a gold pendant necklace wrapped twice around her neck.

Personality
Yae is

History
Yae was born with a quirk mutation which gave her perfect memory. Her mother was a researcher at an underground research facility and readily used her as their latest test subject. She spent the next thirteen years of her life undergoing various tests and procedures. The researchers wanted to see the extent to what she could remember and what her max capacity was. Even as a baby, they put her under intense research, treating her less as a human being and more as a doll to experiment upon.

She was forced to memorize texts ranging from the mundane to the highly illegal, as well as texts from other nations. As she got older, she was made to do work to train her mind and increase her analytical skills. She slowly but surely surpassed the average academic level of her age demographic, skipping years in her education. The researchers called her a genius and even struggled to find problems she couldn't eventually solve or find her way around to a solution otherwise.

One of the researchers introduced her to the piano, which she took to immediately. Playing the piano became her only passion and she would practice for hours in-between tests and studying. It became her only way to express herself in her complete solitude. She would regularly hold mini-concerts for the researchers during their downtime and some even began looking forward to hearing her play. However, it also became her punishment to not be allowed to play if she acted up or refused to cooperate, becoming a way to force her to work with them.

When she was thirteen, the research facility was raided by heroes. Some of the researchers fought back, some even dying in the process, while Yae remained passively at the side. One of the heroes brought her outside for the first time since she'd been taken to the facility and she spoke to a detective. Afterwards, she remained in police custody until they found a man who would take her in and raise her. He gave her a name and became her father from that point on.

The first two years were difficult as Yae had no prior experience interacting with other people. Her father tried putting her into school, but she tested out of it almost immediately and that left her with nothing to do otherwise. It took months of him trying to coax her out of her shell for her to mention the piano. The day after, she woke up to a piano being brought into the home. After that, she got along with her father much better, growing closer to him and even opening up to him more as time went on.

When she was fifteen, he adopted another child, a boy who had been given up because he was quirkless. Yuki and Yae were immediately attached to one another. He stuck to her side at all times, becoming the one to finally pull Yae's emotions out into the open. It was only thanks to him she found the ability to express herself again outside of the piano. His kindness and positivity rubbed off on her and she began adopting some of his habits into her life.

In return, she began teaching him piano and helped him with his schoolwork as he got older. She taught him to stand up for himself against bullies and to come to her or their father for help if things were too difficult. She became immediately protective of him, as well as her father, as her emotions emerged and matured. Her father supported her as she found herself, comforting her when she became overwhelmed and assuring her and Yuki were safe regularly, promising to protect them no matter what.

Still, she struggled to come to terms with her newfound ability to feel and how it clashed with her initial upbringing. She often found herself coming out of a daze, having been staring off into the distance for hours on end. She remembered vividly her time with the researchers and wondered if anything had truly come of their work on her. Noticing her dissociating from reality, Yuki introduced her to Present Mic's radio show to fill the silence and helped her find other ways to keep herself grounded. That often resulted in her spending hours playing the piano just to have something to do.

When she turned 18, her father was contacted by U.A. to speak with Yae. She was asked if she wanted to lend her genius to their students, helping them learn and grow as people and heroes. She was initially hesitant, unsure if she could really be helpful, but Yuki was the one to give her the push to finally agree. He offered that the experience could be worth it regardless of the outcome, plus she would become more knowledgeable about the hero world and help him become a hero in the future with it. Her father also convinced her that she would need to be around people at some point and heroes could keep her safe from outside threats.

Their family moved so she could be closer to the campus and Nezu even got her a driver to use at her leisure. The heroes were more than happy to welcome her to the team despite her age. At first, she kept her distance and simply did the work required of her silently. However, Present Mic had taken a shine to her and worked to get her to open up more, often inviting her to hang out with him, Eraserhead, and Midnight outside of work. As a result of their hangouts, the three began interacting with her more at school, prompting the other teachers to do the same until she had been fully accepted as their coworker and friend.

Characteristics
Memorization: Yae's quirk gives her perfect memory. She can recall anything she's experienced down to the most minute details. Her memorization includes all of her senses and the vividness of her memories never fades, although she can store them away so they don't overwhelm her mind. She can recall them at any time in the future, meaning she can even remember things from her early childhood with utter clarity. She can also draw out anything in her memory in perfect detail. She describes her memories as movies recorded in her mind, with an endless library tucked within a vault she can open and close at will.

Enhanced Stamina: As a result of the various trials and tests she underwent growing up, she developed a large pool of stamina. She can undergo intense physical exercise for extended periods of time before becoming exhausted. She can also hold her breath for up to 10 minutes.

Pain Resistant: She has very muted reactions to pain and any injuries inflicted on her. She's seemingly completely unfazed, coming off as if she's either unbothered or somewhat amused by attempts to hurt her.

Keen Intellect: She is very gifted in academics, having tested out of school at 13. She also has a deep understanding of the human psyche and an analytical mind, able to put together environmental and behavioral clues to come to a rather accurate conclusion.

Musical Prodigy: Thanks to her perfect memory, she need only look at a music sheet or hear a piece once to be able to play it herself. She learned piano at a young age and has since shown talent in other instruments as well.

Trivia

 * She enjoys reading mystery novels and playing piano.
 * She is fluent in English, Mandarin, French, Spanish, and Russian.
 * Her pendant has the hanzi for 'flower' engraved on it.
 * Her name was given to her by her adoptive father; she did not previously have a name.