Prologue- part I: After Death and War

After the end of the Holy War between the Black religious Order and the Millenium Earl had finally ended, Allen Walker, the last exorcist, their shining star of hope, died from his wounds, finally able to rest peacefully. But rather than going to heaven like many thought he would, his spirit roamed the Earth, mourning his friends who could not enjoy the dawn of the new world. His heart darkened and eventually turned him into a hollow. He began to eat other spirits and grow; he learned how to go to Hueco Mundo and constantly fought to be the dominant soul in his body.

When he was a Vasto Lordes, he met Aizen, a shinigami, who told him how to become an Arrancar, which he did become, but he grew stronger and could've become an Espada for Aizen, but he refused that offer, preferring to be free and going back to the world of the living, where he befriended the Vizard and Urahara Kisuke, who set him up with a special gigai he invented for Allen, so that he could live a normal life and maybe even go to school. He was an exchange student from Britain who was in the musical programs, or so his alias would say, courtesy of Urahara-san. Being the Fourteenth Noah had left him with a huge musical interest and talent, even after death.

He became known as each school's prodigy musician and this continued through college, where he graduated as a professional musician. He repeated this over the next two centuries, even if only to keep up with the new education systems, for it was constantly changing over time. Allen was always friendly to his classmates, but he did not get too close or befriend anyone, he was just loved and adored by everyone. But, contradicting his cheery personality, he dressed to match his darker personality, which no one messed with. He commonly dressed in all black with the occasional gray or dark blue, until he started going to schools where they a uniform.

He usually explained his white hair to be from trauma from some form of accident that killed someone close to him when he was younger. The scar was from glass from the accident that cut his face in an odd fashion. His arm was usually just a plain deformity or sometimes a bad burn from a fire that his trauma as well originated from.

Although his gigai body remained relatively the same over the centuries, his real body as an Arrancar changed a fair amount, especially his hair. His hair grew incredibly long, all the way down to his ankles. He attempted cutting his hair on multiple occasions but it refused to stay cut short, it would grow right back within the hour. He usually kept it in a long ponytail. He wore a white sleeveless shirt and white pants, both lined with silver at the edges and an extra stripe on the sides of the pants. He had a white pouch hanging from a silver belt hanging loosely around his waist. He wore no shoes, so he went about barefoot. Belts from his Crown Clown wrapped around his limbs. On either arm, it wrapped around twice in spaced intervals on his upper arms and once more all the way down his lower arms to his wrist. On his legs, the belts went around once at his upper thighs, another across his knees, and a third at his ankles. His outfit emphasized how white he was, almost so much so that his left arm was barely noticed as black from most.

Allen's normal life remained just as such for a long time. But when he transferred into Karakura Town's high school, his life became a little more interesting as he watched Ichigo Kurosaki and his friends grew more powerful as they rescued Rukia and defeated the Bount all the up to right before they met the Arrancar.

Prologue- part II: Odd Occurrences

"Class, we have a British exchange student joining us today," the teacher announced. "His name is Allen Walker and I hope you'll welcome him. He will come in later after he's finished talking to the principal."

"A new student?"

"I wonder what he's like."

"Do you think he's cute?"

"We've never had a foreign exchange student before."

A knock on the door was heard and everyone shut up as the teacher let in the new kid and introduced him. He was indeed a unique kid. He had shoulder-length snow white hair that his a part of his left eye, which was a stormy gray which turns silver under the right light. A red line was seen poking out from under his hair, the rest hidden underneath. He was even capable of pulling off the school's uniform, too, as well as wearing white gloves. He bowed and introduced himself, "Hello, my name is Allen walker. I am fifteen and come from England. I hope we can be good friends."

"So polite. Why don't you go sit next to Ichigo over there," the teacher pointed. Allen thanked her before sitting down next to Ichigo.

Allen held out his hand, "Hi, I'm Allen Walker."

"Kurosaki Ichigo," he replied hesitantly and shook his hand. Allen flashed a smile, but Ichigo felt it wasn't real, not completely. He felt there was something strange about the new kid, more than just physical appearance.

It had been a few months since Allen joined their class. Since then, Ichigo became a shinigami, they learned Allen was a very talented musician, and they had rescued Rukia. Ichigo and his friends had all felt, at some point in time in Soul Society, that they were being watched by someone, but they never figured out who or what it was. They eventually just let it go, claiming their minds were playing tricks on them.

Allen's black side was something they learned not to mess with the hard way. One day during lunch, they were eating under the tree, Ichigo's normal friends were playing poker and anyone was invited to join. Ichigo and his not-so-normal friends either watched or played. Renji, Ikkaku, and Ichigo decided to join in, everyone else watched.

Allen was sitting under a tree across from theirs eating his lunch alone. Since he was already dead and no longer required Innocence, or even food, his lunch was small, even for a normal human. He was completely ignoring the game for the majority of the period. Renji, however, reminding Allen of a more aggressive Lavi. He called over to Allen, "Hey, Allen! Why don't you join us?"

Allen flashed them an apologetic smile, "It's probably best I didn't." He returned to eating and Renji and Ikkaku nodded to each other and walked over, grabbing Allen from under the arms and easily dragged him over to the circle. Allen was unfazed and didn't fight, just kept eating his bento. Allen sighed. "You sure you want me to play?" The others nodded. "Fine… Deal," he challenged. He had an evil grin and a demonic aura. The others were taken aback by his change of attitude and shakily dealt him a hand.

It didn't take long for Allen to lay down a royal straight flush, laughing evilly to himself. Too bad no one was smart enough to quit then and there. By the end of the period, Allen was walking happily back to class and the boys who were playing were now struggling to get their clothes back on, blushing in embarrassment all the while.