Born to the unconvicted serial killer Fujimaru Hosokawa, and the corrupt detective, Matsuri Hosokawa, Mizu's childhood wasn't exactly ideal.
Her mother was often forgot she had a child, leaving her in a room with a TV on for hours on end, on a good day.
Her father was a bit bipolar, like a drunkard. Only instead of alchohal, he ran off of serial murders. On days he killed several people in a row, he was a doting father, who brought home icecream.
On dry days, he would forget she even exists as well, much like her mother. And if she harrassed him, she was likely to be punted across the room.
This came to be a sign that bloody boots were a good day, and normal boots were a bad day.
As Mizu grew, she came to realize she had a strange power. She could see ghosts. With her father's hobby, this became even more traumatizing. The ghost she saw were not quite so happy to be dead. And the fact that his daughter could see and interact with them made them divert their anger to the young girl, bullying her in any way they could.
They would intentionally taunt hollows, and lure them into the house. It was sheer coincidence that the area was well enough patrolled that shinigami disposed of them before anything bad happened. Because of this, Mizu had a lot of 'interesting' conversations with shinigami. Most of which complained about her, because of the workload.
One day, her father, running from several cops, grabbed Mizu and her mother, and ran out the house, calling it a mix of a ''very good day", and "A hint of oh shit." As they ran, he accidentally dropped her into an alley, losing her for several hours.
When he finally found her, she was a bit beat up from the area being more than a bit rough. He broke in tears, and claimed he wouldn't let her get hurt again like that.
Her mother tried remembering Mizu's name. And upon failing, stood silently behind.
Luckily (?) For the family, no incriminating evidence was found in the house, and the Hosokawa family returned the next week.
Her father enrolled Mizu into a Karate Dojo, to have her be able to protect herself. He also taught her himself, always having a practice dummy (of questionable origin.... and validity as 'dummy')
After a couple of weeks, on a VERY good day, he turned to his daughter, and gave her a pendant (with a slight blood stain on it), and told her she was the love of his life, putting it around her neck. It was an item she would treasure for the rest of her life.
As Mizu neared her 18th birthday, she excitedly ran upstairs to tell her parents she had made breakfast. On her way up, she tripped and broke her neck, beginning her life as a plus.
At her funeral, her pendant was stolen, it was the one thing she truly cherished besides her father.
Somehow, despite her death, patrolling Shinigami missed her, allowing her to live as a whole for quite some time. Her will to not pass on was extremely strong, she didn't want to go alone.
She waited at her house for a year, her soul chain barely holding.
Everyday, she would see her father come back.
Then one day he didn't.
She didn't want to admit it, but she was a little glad, figuring she could pass on with him, but unlike her, a shinigami caught him fairly fast, running from the law til the last. His judgement was hell.
Mizu was so confused in of what she should do. Her soul chain was nearly completely eroded. She decided before she would pass on, she would find her pendant. Having a strong connection to it, she could sense in a general direction where it was. She searched for weeks, walking to different towns. She was attacked by hollows several times during her treck(normally in the space of a day), barely escaping them.
Each time she ran, it became a little easier, her reitsu rising. But this in turn attracted more hollows. It was an odd case where an unchecked plus was becoming as strong as a shinigami, through sheer number of near death experiences.
Still, her chain eroded, eating itself, it was little more than a stud as she stumbled into Karakura town.
She finally found her pendant in a bizzare accident, stumbling into the trailer of famous actor, Dosu Kurogana (Next character I'm doing). The odd twist of fate was that he was a powerful medium, well aquainted with spirits. Infact, it was how he had started his TV career.
After she explained the situation to him, he happily gave her the pendant, with a crying hug.
"I couldn't hold onto something like this after hearing that."
It was the first time she'd felt cared since her passing away.
But as a tear dropped down her eyes, her time was up as far as her chain goes, it finally reaching her heart.
As she collapsed, the man grabbed her hand, and poked where her chain was drilling into her heart, before flaring his reitsu, giving her part of his reitsu to re-extend the chain.
Not only had that man been kind to her, he had saved her from becoming a hollow, although it was only temporary, the chain began gnawing itself anew.
Dosu said he knew someone who could help, a former shinigami, Keiasu Haiyou.
Taking her to him, even calling in the studio sick for the day, they arrived at the strange shopkeepers door.
Originally Posted by Yosh
Mizu nodded, before beginning her training.
Over the next several years, Mizu became incredibly strong, slightly above liutenents, but slightly below captains. It was a daily experience her life was at risk, exponentially increasing her powers.
Meanwhile, she fell in love with Dosu, the two becoming a couple. (which classfies as Necrophilia). She's also considers her teacher one of her greatest friends, and is extremely loyal to him.
It's thanks to these two men that she's happy to continue in the World of the Living, with people who care about her. Her bond with them is her most precious thing now.