A Yu Yu Hakusho cross where Izuku is Yusuke. Have fun reading!
When he was very little, he went to live with his aunt temporarily because his ma was sick. Then his ma got worse and the doctors made the wrong guess as to why and she didn't wake up, so he was permanently adopted by his aunt under a new name.
Then he became spirit detective and had a lot of crazy adventures. While he never became the pro hero he wanted, he still saved the world and made friends he could count on which was good enough for him. It wasn't as flashy or grand as the pro hero career he once dreamed of (though it paid better once Botan slipped up and mentioned he was supposed to be getting paid for doing this shit) but it was enough.
He was not expecting that freaky attack which he should have been able to shrug off with ease considering his power levels to cause this.
Urameshi Yusuke woke up to a ceiling he had almost forgotten about, to a home he thought wouldn't exist again.
It took him a few days to realize that yes, he was back in his ma's home before she got sick and that no, it wasn't a hallucination. If it was, he was going to end that damn demon in the most painful way possible because it would hurt like a bitch to see his ma alive again only to learn it was a hoax.
However when Inko hugged him for getting an A on his last test...like she used to before he moved in with Atsuko and quit bothering to show his actual intelligence... Yusuke felt her spiritual pressure and had to hold back tears.
It was her. This was for real.
And if this really was his new reality, then he was damn well going to make sure Inko lived this time.
Third POV...
Inko could sense there was something different about her son. He was a bit more clingy than before and oddly more violent. In fact he reminded her rather strongly of her older sister Atsuko. Her reoccurring headache came back, and she had to briefly grasp the counter to stay upright.
If not for the vertigo, she would have noticed how intently Izuku was watching her.
Inko powered through it like a champ...she had plenty of practice. That is until she collapsed while at work and her manager reluctantly called her an ambulance after the "whining" got to be too much from the rest of the staff.
While at the hospital, she made a point to call her sister Atsuko to get her son from school. He was too young to care for himself and it was past time she met her nephew.
Atsuko was as 'friendly' as ever, and because of her son's pro hero ambitions Inko had originally kept the two apart. Atsuko unashamedly associated with outright villains and the odd vigilante after all. Not to mention she was a major drunk when the mood struck, which was often.
Atsuko had Izuku with her...her son was surprisingly calm around his often rowdy aunt.
"Hey kid...why don't you go get us some sodas while I talk with your ma for a while," said Atsuko. She handed some cash to Izuku, who nodded and left the room.
While the two sisters chatted briefly, mostly to talk about living arrangements, Izuku made a beeline for the vending machines. He knew where they were all too well.
However, the two females didn't know he made a side trip and purposely ran into his mother's doctor.
"Whoa there little one. You have to be careful in a hospital!" said the doctor with a placating smile.
"I'm getting drinks for aunty and mommy!" said Izuku. Inside, Yusuke had to cringe at the 'goody-goody' act he had to put on.
"Which room are you heading too?"
Izuku told him, and the doctor made some excuse to help him 'carry' the snacks. Which was when Izuku knew this would be a perfect time to act.
With a few subtle queues (mostly from what he learned after the fact were warning signs), he let the doctor know about what symptoms he had seen his mother suffer from. On their own they were innocuous...however combined they pointed to a very serious condition.
Izuku brought his mother and aunt the drinks and the snacks he had bought with the remainder. After a while, his aunt Atsuko took him home with her.
She would have to refrain from drinking, at least for a while.
Izuku, the runt, took one look at the state of her house and sighed in exasperation. Without being told he started cleaning up with ruthless efficiency without any regards to the sheer mess. To be fair, Inko was the homemaker of the two, not Atsuko.
Strangely the kid knew what to leave alone and what was generally trash without being told by Atsuko, who left him to it. He didn't even complain about the instant ramen they had for dinner.
The next morning the kid got dressed and walked himself to school without bothering to wake her up. Atsuko rolled over and slept in...at least until noon anyway, when she was rudely woken up by the phone.
"What is it?" she demanded, irate. "The kid did what? I'll be down there in a bit."
Not even one day and the kid was already giving her headaches.
Atsuko had a headache, but it wasn't entirely the fault of her nephew. The kid had done what any boy should have and taught the resident bully where his place was. She was actually fairly impressed the cinnamon bun she had taken her nephew for had the balls to punch the kid in the dick and make it count.
That Bakugo kid hadn't stood a chance, and Izuku only had a few minor injuries out of the deal...the blond had a broken nose, two black eyes and his right arm had gotten a pretty good fracture, not counting the pain he had been in from the punch to the crotch.
She waited until they had gotten back to her place before she looked at her nephew, who didn't look repentant in the least. At least he was only suspended for three days.
"Well brat, what do you have to say for yourself," said Atsuko.
"He deserved it," said Izuku defiantly. He had been silent the whole time, not bothering to justify himself to the adults because he knew damn well they would take Bakugo's side either way. "That jerk heard Kaa-san was in the hospital and said that it was because she got sick of having a quirkless loser like me for a son."
That and after almost a lifetime of living with Atsuko, his tolerance to that sort of bullshit had dropped to zero. There was a reason he was known as the terror of the neighborhood, and despite what people said about him he never deliberately went after people weaker than himself. He became the biggest delinquent around to keep the other delinquents in line for fear of him.
So putting Bakugo into his real place of a proper pecking order had come so naturally he hadn't thought twice about it when the little shit started insulting his ma like that. To disparage her very serious condition all because of his own quirkless status...the bastard had deserved it and damn if Izuku was going to take his shit anymore. Besides, he had nothing of bad memories once Atsuko had broken him of his ingrained reflex of backing down from a fight.
Atsuko looked at her nephew, then sighed.
Then she did something Inko wouldn't have, because she preferred the 'peaceful' life of a house wife to the kind of lifestyle Atsuko thrived in.
"Good job," she praised the brat. Izuku blinked, mostly out of surprise. "But next time make sure the little shit doesn't immediately go crying to the adults."
Izuku gave her a tooth-filled smirk she recognized all too well. It looked like her spitfire of a nephew took more after her than his mother.
Izuku kept up his studies while on suspension...though Atsuko had to wonder what sort of elementary school required such high level books. Bah, it wasn't like she completed high school to begin with.
It was right before the suspension was about to be over with that she got a call from the hospital. It was about her sister.
Rather than bring the kid with her, she left him at the house with strict instructions to not leave it. Izuku was on her rather pathetic computer playing games, so she assumed he'd be fine for a few hours.
She had no idea that the brat had only kept up the charade until he knew damn well she was at the hospital.
"Let's see... if I remember correctly there was a 'special' page that only those in the know could access..." said Yusuke, mostly to himself. "Now what was it again..."
It took him fifteen minutes, but he was able to get past the firewall and gain entry to the demons-only section of the internet. It had all sorts of things that most people wouldn't be able to access. He ignored the pages involving the more raunchy activity as he had never really cared for it. Some of the depravity available was too much even for his stomach.
He was more interested in acquiring a few items that would make his life a little easier. Besides, he missed Puu.
Then he saw the price tag and balked. He was going to have to shelve this for a while until he had something of worth to trade for the spirit beast egg...acquiring them was risky, but not impossible.
His finely tuned senses warned him that his aunt was returning. He got off the sites and cleared the browser history, before going back to the mindless game he had been playing earlier.
Atsuko came back with a serious expression on her face. It was clear that the doctors had told her some grim news.
After two nights of heavy drinking, she broke down and told Izuku what the doctors had told her.
"Kid, come here for a minute," said Atsuko.
Izuku came over.
"Is Kaa-san okay?" he asked, concerned.
Atsuko thought about how to tell him, then decided blunt truth would be best.
"They found something bad in her head. The doctors weren't sure what it was, so they did some tests and it turns out your ma had something really dangerous growing inside her brain," said Atsuko carefully.
Izuku knew. He remembered all too well hearing the cold truth from his aunt the last time how the doctors missed the tumor in his mother's head and how they had failed to catch it in time. Atsuko's words made him resolute, and from the sounds of it they had caught it early enough that Inko stood a decent chance of living this time.
There was, however, a catch. If Inko was to have any chance of recovery, then she needed rest. Which meant once she was out of the hospital Izuku would likely have to stay with his aunt until the doctor's cleared her, which could take months, if not years.
Atsuko was not the best mother material. Far from it. However she would happily suffer through it if it meant her sister had a chance to fully recover. Besides, the doctors weren't advocating her son permanently remain with her, just until Inko was capable of taking him back.
Izuku looked at Atsuko, and knew he had an important decision to make. While she wasn't a perfect mother, she had honestly given a damn when he had died and had kept his body around until he managed to make his way back. In her own way, she did love him.
"I'll stay with auntie until ma is better," said Izuku calmly.
Atsuko felt like she had been punched in the gut, but mentally resolved herself. She wanted Inko to get better and the best way she could help was to take care of the kid.
Besides, the brat grew on you after a while.
By the end of the month the paperwork was filed and Atsuko was granted temporary guardianship of her nephew until her sister's health improved.
Due to a series of circumstances...mostly Izuku beating the shit out of Bakugo until it got through the blond's head he wasn't going to take any of his crap anymore... the newly dubbed Urameshi Yusuke was enrolled in a new school and a new district.
In order to distance himself from his other name, Yusuke went to the Quirk Registration Office and with the help of Atsuko's "friends", managed to fudge the paperwork so that as far as the school district knew, he had an energy based quirk of some sort. Not very well trained, but still a quirk.
Yusuke wished he had know about the spirit world years ago, if only to save himself from half the heartache he had gone through growing up.
As it was, he had started a growing reputation in his new neighborhood as the top delinquent. Not that Atsuko cared about the parent's bitching to her.
By silent agreement, the aunt and nephew kept quiet about Yusuke's little...adventures...to Inko. She didn't need the stress from worrying about her vigilante son.