Shizu had a complicated childhood. because of that she is a very reserved girl, she sometimes has trouble to go to others and open up to them for fear of being laughed at or scared of her. When she decided to become a heroine, she became very serious, almost never smile or laugh and always focused on her ability to control her quirk. Being more often reserved her classmates find her a bit snobbish. She is affraid to let people be close to her if it's for hurt her.

When Shizu was born, his mother was surprised to see the skin of her daughters' hands and legs turn purple-black. She wondered what kind of quirk that could represent. She did not wait long, a few days after returning home Shizu awakened her powers by destroying the cradle in which she slept. Frightening her parents took her to see specialists to inform them about her powers and how to settle it. They learned that Shizu had necrotic power and could destroy things. Her mother was frightened and asked what to do against it, the specialist told him that they had to cover her hands and legs and wait for their child to be older to teach her how to control them. 

Since that day, her mother didn't look at her as before, she no longer looked at her with love but with horror and fear, she didn't take Shizu in her arms anymore. Shizu didn't understand why her parents and especially her mother seemed to be afraid of her, sometimes asking her not to approach them or to touch anything without her long gloves ..... 

When she came outside Shizu was crossing even worried looks, words down that hurt. When she went to school and idolized the heroes like any other young child the other child making fun saying she had better be a vilain. That she was only going to destroy rather than save others. She was abused and harassed. Shizu was really sad because even at her house the speeches were the same. Only her aunt didn't seems to be afraid of her.

when she was in primary school, her teacher, who saw that the poor girl was being harassed by her classmates, decided to talk about it with her parents. She was surprised to see that the mother said the same about her daughter, that she was dangerous.
It was some time later that Shizu started to hide under loose clothes, staying alone in corners, she was scared when someone got too close to her. This is how the teacher ends up realizing marks of blows appear on Shizu's body. She ended up calling social services when she realized it wasn't stopping and the parents didn't seem to give an explanation. This is how Shizu was heard, she confessed that her parents hit her and punish her with no meals if she touched something, if she approached them too close and worse if she used her power without wanting to.

After investigations it was decided that his parents should lose his custody and Shizu was placed with his aunt who lived in a city far from his parents. The latter no longer had any rights over her and were even obliged by justice to pay a very large fine by avoiding prison.
Shizu, aged 11, then started her life again with her aunt. However, all these years of abuse remained engraved in her.

By hearing all these words Shizu thought they were probably right and tried to do something wrong ... Her hands shook and tears flowed refusing, she was finally able to nothing. ..
A young woman passing by called her and asked her why she had tried to do this wrong thing. Having too much of it for her Shizu explained to her that her power was a burden ...
The young woman explained that it was up to her to prove to them that they were all wrong and to make of her power an asset!
Their talk did a lot of good to Shizu who decided to follow her advice, she worked seriously and entered Yuhei as a hero!
Later, she realized that the young woman she had met was a famous heroine now.

She later learn that her parents had another child, a little boy, and they were really happy together. An hapiness she never was able to have.

Necrose/Rot

User can cause anything organic to wither, rot, decay and eventually disintegrate, whether living or deceased. She can use her power with her hand and her legs, it's because of her quirk that the skin on her body part turn to a dark violish color. She had to wear special sock for being able to walk without having to destroy the ground specially when she had difficult to control her quirk     

If she use her quirk on living being if she touch it more than 10min the damages will be irreversible

she can destroy anything and is specially useful for find innocent people under the rubble or create openings in or out of confined spaces until the control stop.

Vilain name: "Death"

Shizu never wear shoes, like this she can destroy anything that can block her way using her feets or hand, she like to destroy doors, wall just to walk stray away in the direction she want.

As she was never loved by her parents Shizu decided once to reach the age of aduldthood to take of abduction  children from families or orphanages who, for her, did not take care of them or mistreated them. She therefore created a large secure house where she raised these poor children like hers with love and intends to destroy and exterminate all those who would get in her way or try to take them away!