Just a heads's up, I did give Izuku the Flash's speed in this one. It made far too much sense that he would figure out how to use lightning to speed himself up subtly instead of learning how to throw around massive bolts of lightning with how strict they are about public quirk use.
Izuku didn't know how too explain it, but ever since he started that draining trick he found himself...changed.
Originally he felt a little stronger, as the hammer bestowed the power of Thor, and he always felt rather perky whenever a thunderstorm rolled in.
It wasn't until he started to channel the excess electricity he had been siphoning that he really picked up on it.
Specifically the fact that things around him seemed to...slow down for lack of a better term. It was subtle enough that he could practice it, but it had side effects. Namely his metabolism shot up considerably. What his mother was saving on her energy bill suddenly went to the food bill.
He found out the hard way that skipping out on meals made him pass out. As such he learned to invest in high calorie protein bars, and was snacking almost constantly.
And that was just to maintain a healthy weight!
Still, he was learning a lot about his new abilities and if he used the extra speed sparingly he was able to hide the change. His mother assumed he was just going through an unusual growth spurt, which made sense because he due for one.
It wasn't until Bakugo used his quirk Izuku and caused him to be sent to the hospital with a concussion and broken leg that things changed again. This time not for the better, as it would lead Izuku to using the darker side of his new abilities.
Coincidentally this would lead to him accidentally figuring out who "Blackout" was. The villain had been terrorizing the area for close to two years now and still the heroes had no idea who it was. From what he heard, the heroes had shifted focus from "new villain" to "new quirk that needed control".
Izuku was laid out flat on the hospital bed with a broken leg that was already healing at an accelerated rate, but because he was busy trying to keep his energy drain at a low rate so it wouldn't effect the hospital, it was going slowly enough to be unnoticed. He was lightly drowsing, but woke up almost immediately when he sensed something was very off.
It wasn't until later that he figured out what...and it pissed him off.
One of the doctors tried to use their quirk to make him believe to a subconscious level that he had lost his leg or that it was damaged to the point that being a hero was now impossible for him. Izuku really got pissed off when his mother was made to believe the same, because there was a defeated expression on her face that made him beyond angry that he was inflicting such a lie on her.
Izuku memorized the doctor's face, and made subtle inquiries to where the bastard lived. The nurses, believing his innocent lie about wanting to send the man a thank you card for 'trying', gave him a general area to work with.
So long as he sent a generic card, no one would suspect him for what he planned to do. Best of all, the jerk had given him the perfect cover story later.
Izuku waited a few days, and sent the card. Then he made a special trip to the area. Thanks to his accelerated speed (one of the most taxing aspects of his new ability, and the most costly in terms of energy and the fact his clothes couldn't handle the friction) he didn't need to take a train or bus to get there. It also made him impossible to identify.
He found the doctor easily enough, he recognized the fancy car.
Now for the distraction.
Izuku fried the circuit breaker, causing an instant blackout in the area. Mjolnir seemed almost eager to help.
The man angrily walked out, and left the door open rather carelessly. Izuku checked the place for anyone else...before sending a massive thunderbolt from above down and destroying his house. A second one crashed into the car, completely wrecking it.
Thanks to prior experience with "Blackout", the electric company had the lights on in fifteen minutes. By that point the devastation he caused was becoming evident, as the fire was too big for the man's rather small extinguisher to handle.
Izuku was already long gone before the power came back on, but he watched the reaction of everyone else from his webcam at home with dark satisfaction.
He knew it was illegal to use his ability like that, but the darker aspects of the man's quirk and the fact he used it on a minor and his own mother really pissed him off. If he had no issues doing something like that, then what was to stop him from doing it to satisfy his darker urges on unsuspecting women?
As it turned out, his guess wasn't too far off the mark...during the investigation to find out who would target him specifically, the cops found discovered a large number of women who spoke up about him using his quirk on them without asking first.
On the plus side, he had a pretty good idea who Blackout was.
It had taken Loki far too long to track down the boy who had claimed his brother's hammer. To be fair, the boy was keeping his new abilities rather low key, which had made it more difficult to find him in a world filled with people who had unique abilities.
He had already found his idiot brother, but his memories were still sealed and he was too high profile, so it was too much trouble to confront him.
Besides, from what he saw, the fool had taken a hit from one of the 'villains' here and would need time to recover anyway one his memories returned.
The boy who had the hammer was practicing discreetly. A wise move considering how...restrictive...the world here was about abilities. From what he had seen with Heimdall, the boy was isolated, hated for not having any abilities.
Besides, the boy was showing cunning and common sense, especially with a potential rival who would take it ill if his former victim suddenly became stronger than him.
"You...are a very hard boy to track down."
The boy froze like a deer in headlights. Mjolnir hummed a bit, though it seemed the child was unaware he could summon the hammer to him directly.
"Who are you?" he asked cautiously.
"I am Loki, of Asgard. And I came because we finally managed to track down who claimed my brother's hammer."
The boy tensed.
"Now...the only question is how to deal with you."
A few hours later...
Loki was inordinately pleased. The boy, Izuku, was a diamond in the rough. With the right teacher, he could become even stronger than Thor. The boy had already discovered several abilities that not even Thor had uncovered, though to be fair his brother was only ever concerned about smashing things or frying them with the hammer.
Izuku was learning control without the use of Mjolnir, hence why he had Loki's full interest.
The boy was lonely, a scholar who delved into the mysteries of the unique powers present on this planet without being born with one himself. And his skills of observation were almost terrifying in a way.
Loki just knew if he took the boy on as an apprentice, he could become an even greater sorcerer than even Loki himself.
Besides, he knew his mother Frigga would adore the boy to bits.
A few days later...
"How did you convince your mother to allow you to leave with a complete stranger?"
"You said that you could teach me magic. There must be a spell or potion that can reverse the influence of another, right?" said Izuku quietly.
"There are a few," said Loki. "But it depends on what influence you're seeking to remove, and why."
"About three months ago, some doctor used his quirk on my mother to make her believe that I was permanently disabled because one of my tendons in my legs was damaged beyond repair due to an accident. Not only did no one bother to investigate why I was in the hospital to begin with, but he also convinced the teachers to spread the lie as well, which means everyone now believes my chances of becoming hero are destroyed. I think it's because of the changes I'm going through that I was spared, but I can't stand the fact he did that."
"I see. In that case there should be a way to reverse it, but it would help to know what medium he used."
"He uses his breath. I may have gone after him when I realized what he did, and during the investigation it was found out that he had used it illegally on others as well. There was a request on TV for anyone who was exposed to him in close proximity to submit to an exam if they ever did or felt something off about him because his quirk allows him to implant suggestions by lowering their defenses against subliminal messaging via his breath. It was some sort of toxin or other chemical," said Izuku promptly.
"And he was working in a professional capacity around others?" said Loki incredulous.
"There was a lot of questioning about whether he obtained the license illegally as well. The investigation is still on-going," said Izuku.
"That narrows it down considerably. Since you won't have much luck reading our writing, I'll look around the library while you're learning with mother," said Loki.
He knew that library backwards and forwards. He could find it faster than the child could.
"Um...I can read a little of it, if you're talking about Norse runes," said Izuku, timidly raising his hand.
Loki stared at him.
"I was curious as to what the writing on the hammer said, so I looked up reference books, but it still took me a while because I had to find other books to translate the first ones since there were none in Japanese..." rambled Izuku nervously.
"Don't worry, teaching you to read our language is going to be among one of the first things on our list," said Loki.
Somehow, that didn't feel comforting to him.
The bifrost opened, and they disappeared. Izuku wouldn't be back for at least a year and a half. And he wouldn't be the same when he did.
In Asgard...
Izuku was in awe of Asgard, as most people would be when they first saw it. Though he looked askance at the horses, he still managed to stay on it until they reached the palace.
Odin was very...imposing, and downright scary. Izuku managed to keep his mumbling habit from showing up. Frigga...had a more maternal, friendly appearance.
Izuku felt like he was in a daze during the entire ceremony, he could only hope he didn't embarrass himself completely.
It was only during the feast that he felt remotely at ease.
Loki smirked. He had noticed the amount of food Izuku could put away after practicing that speed trick of his. He also knew that Asgardian feasts were often packed full of food, and that Volstagg tended to put away quite a bit.
"I wager the boy will out-eat Volstagg," said Loki suddenly to the warrior's three.
"That slip of a child?" scoffed Volstagg. "He wouldn't be able to finish off a single boar, much less beat me!"
"Are you willing to make the wager then? Loser has to pay the food bill of whomever wins for the next week," said Loki.
"Deal," said Sif. All of them shook on it, in front of witnesses. This was going to be greatly entertaining.
For Loki.
Frigga wandered over to her son.
"What are you planning?"
"Izuku has developed an odd habit of 'borrowing' electricity from devices around him. Since he cannot take it from his normal sources, he will have to do so with the hammer. It's a bit more difficult than normal, and he doesn't carry it with him regularly. I believe doing so will speed up the process of his body converting to that of a full Asgardian."
"I'm sensing a catch," said Frigga smiling.
"His metabolism speeds up to inhuman rates. He had to restrict his training to once a week because his mother couldn't keep up with the food bill, and if he doesn't eat large quantities of food he passes out," said Loki. "They put special additives to his normal food just to keep him at a healthy weight."
"So you're trying to encourage him to not hold back and make Thor's friends suffer a bit," said Frigga.
"The sooner he learns to regulate his full ability to sustainable levels, the faster he'll progress in training. Right now his body is still converting because he was unable to push himself to his proper limits. He'll have no such issue here."
Izuku had held himself back out of consideration for his mother and the family expenses. Loki would have to break him of that habit once he settled in.
Asgardians rarely needed an excuse to bet for fun, so when Loki's wager became known everyone started placing bets.
Loki was already cackling at the killing he was making by betting on Izuku...even if he didn't beat Volstagg today, there was a strong chance he would do so after training, which was what he was counting on.
Izuku felt a little embarrassed, being at the center of attention like this, but quickly got over it in favor of the food before him. He had gotten used to being constantly hungry, but had learned to ignore it. Now that he was given permission to eat until his stomach felt about to burst, he was going to take advantage of it. Besides, the food was really good and he was starving since Loki had him demonstrate his ability before they arrived in Asgard.
Volstagg looked a bit ill. To be fair he had eaten a large amount of food before the feast, and had thought this a simple wager. He never thought the boy could match him, let alone beat him in an eating contest.
To the shock of the onlookers and the dark amusement of Loki, Volstagg ended up being the one to bow out first with a groan.
Loki made very sure the people who bet against him settled up first. Izuku finished his last plate (which was the second one after Volstagg bowed out), before calling it quits. He looked at his hands with dismay... there weren't enough napkins in the world to handle the amount of food he had just put away.
"Come on, let's get you cleaned up," said Loki smugly. Frigga hid a smile at the horrified expressions of the Warrior's Three, since they had agreed to foot the food bill for the kid outside the palace.
The full stomach and the sheer amount of excitement of the day caused Izuku to be out like a light the second his head hit the pillow. It was really awkward wearing such nice clothes, or being in a bed far bigger than the one he was used to.
This was going to be a long six months, which was how long Loki had told Inko the initial training would last. She was so upset about Izuku's original dream being crushed she didn't dare say no to him trying something else.