Aizen was orphaned at a young age. His parents died in a fire. But it was no ordinary fire; it was black fire. After the house burned down, a figure in black walked out of the rubble unscathed. In his hands, a baby was crying. He injected the baby with something, and left it on the front of the house. The figure in black disappeared without a trace. Days later, it was reported that Aizen's parents died in a fire caused by faulty electrical wiring.
A Mancer who saw the whole thing adopted the said child. This Mancer, a Wind user named Derek Alseif, took care of Aizen as his own son. Aizen grew up to be as "weird" as his foster father, in personality though. But something weird was also happening to Aizen as the years went byーhis jet-black hair began changing to white, his blue eyes became redーand he was just 10 years old at the time. What also shocked Derek was Aizen's hidden yet great ability as both an Aeromancer and a Pyromancer. His Pyromancy, however, was limited to be only to produce a small fireball. Despite not having any experience in the past, Aizen has showed enough power to make Derek fall on his knees. Derek was already powerful enough to destroy a city.
With that, he decided to teach Aizen all he knew as an Aeromancer-the basics, all his techniques and spells-and as a complement to Aizen's style of fighting, he taught the kid Martial Arts. He was proficient enough to apply physics to his attacks, making his normal punches and kicks seem deadly with the application of Aeromancy. Of course, his specialty is long-ranged spells, acting as a sniper. With his long-range Wind spells, powerful but unorthodox style of close-combat fighting, and quick thinking, Aizen was a force to be reckoned with.
As Aizen reached 17, he knew of his past: on how his parents died in the flames of a black Pyromancer and how he was injected with an unknown liquid while being a baby. With this information, and without a shred of doubt, he decided to find anything regarding the Black Pyromancer.
One day, Aizen recieved a letter from the Vale Institute of Higher Learning. After reading the letter, it turns out that Vale is an institute for Magic and Mancers, and they wanted him to attend. Seeing this as an opportunity to learn more about himself and the Black Pyromancer, he accepted the offer. Derek, now on his 50s, knew that it was a dangerous journey for Aizen, but it was a journey that had to be taken by a Mancer just like him.
Meanwhile, in the shadows...
A figure in black stands amidst a circle of black fire. The black flame dances with the changing wind. After a period of silence, the figure spoke while gazing at the Alseif residence.
"So it begins, Aizen Alseif.
The hunt begins."