Sealed away in a place where neither light nor darkness exists. He waited to exact his revenge. The grudge he held against those who imprisoned him filled his entire being. Each passing of centuries only fueled his burning desire to avenge himself.
And so, locked deep in that dark place, he bided his time.
A hollow who gained Shinigami powers by removing his Hollow mask, that's what he is. An Arrancar. The first self-made Arrancar and one of the four original Vasto Lorde of old. He left Hueco Mundo and invaded the Soul Society in a quest to destroy all Shinigami.
The Shinigami realized he was too strong to be defeated in combat and lured him into a trap. Sealing him in the Underground Chambers of Central 46. He managed to escape when the seal is weakening and began his act of vengeance against the Shinigami, only to fail again.
It matters not. For though a righteous man falls a thousand time, he rises again. Even in the body that is different than his previous one.
A purified soul is supposed to be reincarnated to the next cycle without remembering the memory of past life, yet his resolve to not give up made him remember everything. To him, defeat is a weakness. And weakness is a sin that can only be redeemed with death.
Arturo Plateiado, Harry Potter. Same difference.
"No one may exist who are stronger than me."
With a confidence bordering arrogance, he proclaimed the words while inside his inner world where he could still take his original form. A young man wearing a basic Arrancar outfit with turquoise hair and yellow eyes. The remnant of his Hollow mask looked like a crest attached to a jaw on his right cheek.
His Zanpakuto Spirit sat next to him, not doing anything with her eyes closed shut giving the appearance of a peaceful slumber. For a Zanpakuto that governed rebirth and destruction, she looked deceptively elegant. Her multi-colored dress was reminiscent of what European noblewoman wore during the 17th century complete with the crown resting on her fiery red hairs.
In truth, the fair maiden never slept, she merely closed her eyes because there isn't anything to see here other than her master anyway. She noticed her master talking to himself while training just fine. That couldn't be healthy. But again, there is nothing healthy about having an empty void as an inner world or a gaping hole in one's chest. Hollows are one hell of sick creatures.
"Master, I think it's time you should go back to the real world."
Hollows aren't supposed to have a Zanpakuto spirit, but Fenix's ability to absorb reiatsu from fallen Shinigami formed one using leftover thoughts of their Zanpakuto spirit as they died along with their wielder.
At first, he doubted if his Zanpakuto could still be called "Immortal King" when the spirit it produced is female, but then the spirit said, "Can't girls be king?"
The docile spirit reminded him of the Primera Espada in terms of personality. Only worse. Other than being ridiculously lazy, she refused to absorb an excessive amount of reiatsu because she doesn't want to get fat. The moment Arturo's zanpakuto become a sentient being, he stopped using it. Relying on an energy blade he projected from his hand instead.
"It's time for Harry Potter to wake up."
With a start, Arturo's child body opened to reveal green eyes staring at his reflection. The shade of his eyes is nowhere as dark as Ulquiorra, the Vasto Lorde class Arrancar who can use Segundo Etapa just like him but keep it as a secret from Aizen. A wise choice. Instead, his eyes nearly looked about the same color with his hairs in the previous life. His hairs are easily tamed in the style he used when he is still an Arrancar. The only thing that made him looked like a Potter is his facial structure.
He had an agreement with the family who lived with him to not bother him, and he will do the same with them. An agreement not very much different from the one he and Aizen made back in the days. That was how he got his own bedroom, not getting locked somewhere in a cupboard under the stairs.
As Arturo is concerned, the Dursley are forced to take care of him due to the insistence of the third party. For now, he is content to make the Dursley's at ease by not doing anything they deemed freakish. They might be human, but they didn't conceal their true nature with unnecessary words and action.
They were honest about disliking you, that's what I like about them.
The voice of his Zanpakuto whispered in his mind. Arturo can tolerate a liar, but Fenix seems to harbor a deep loathing against them to the extreme. Look at the bright side, at least it motivated her to get serious and kill someone even if only a little bit.
"It's my turn to cook breakfast this time. There can't be no better cook than me."
Compared to the Dursleys, you are only better than all of them combined, master. I would like to see you compete against Gordon Ramses.
"It's Ramsay, you bird-brain."
Have you ever thought that by insulting me, you are insulting yourself?
"You have a point. Remind me to not argue with you the other time."
His Zanpakuto fell silent to that remark, probably going back to sleep or remind him not to talk to her when he is not alone. Talking to yourself is the first and most obvious sign of insanity, even imbeciles like the Dursleys knows that.
Arturo hastily prepared today's menu, consisting of a large portion of English breakfast enough to feed a family of seven children for months. The Dursleys appetite reminded him of a certain Espada whose name he couldn't pronounce in this body.
While he wasn't an official member of Aizen's glorified lackeys, he still felt the need to keep a tab on each of them just in case they break their own part of the agreement. With his shapeshifting power, he can transform into anyone he had met to gain a vital piece of information.
They ate their breakfast in silence, not wanting to let out a single word. Until an owl dropped a letter on his face and all hell breaks loose. Stupid bird.
Petunia recognized the seal on the letter and immediately tried to dispose of it. But Arturo is faster. The look on his aunt's face is enough to see something terrible is going to the letter should he handed it to his aunt which in turn will cause a chain reaction. Whoever sends this letter won't stop at anything to make sure it's properly delivered to its proper destination.
He knows. The letter is enveloped with the same type of reiatsu he felt from the person who brings him here years ago. That night when a stray soul fragment went too close to him and got accidentally eaten. Fenix complained about how awful it tasted and how she wished to have it serve her instead.
"You are not going there. End of story."
It seems like his giraffe of an aunt has something to say about the matter. Arturo has to say he is impressed by Petunia's sudden burst of courage to say something straight to his face. She was always looked so afraid of him for one reason or another although he never showed her any of his power.
Those humans are smarter than any Shinigami we have met before. In face of the unknown, they know how to stay away from danger. But not now, what do you think makes her like this?
"Would you rather have me around you every day or just less than half of the year?"
"Fine, just promise to not bring any of your freakishness back home. I was wrong to think my sister's son could be any more than normal."
"Boy! We took you in as one of us and this is how you paid us back?"
Humans can turn purple? I thought only Glotoneria does that?
"I never asked you to took me in. I wish we can part ways and never see each other again, but every time I escaped…"
"That old coot has a way to make you come back to us."
For someone of his age, the Dursleys know Harry Potter is a different beast than the rest of other children. He is ruthless and calculating, always thinking of a way to come at the top of everything. He doesn't have many friends in the school because of that. The kids are scared of the wicked genius who made skipping grades looked laughably easy.
It was only common sense that the Dursleys told him the truth about his parentage. There are no points in keeping it a secret if he is just going to know it anyway. Harry Potter always have his way to victory. He won't accept failure. To him, nothing is over until it's over. The only way for it to be truly over is to give up and giving up is not on his dictionary.
It's not on your dictionary because it's not in Spanish.
"Don't worry, I won't play nice with the people responsible for me being stuck here. I am going to teach them a lesson. No one mess with me."