He didn't know what had happened, all of a sudden he just existed. He opened his eyes drowsily and looked up at the figure holding him. Although all he saw was a silhouette shrouded by bright light, he couldn't help but feel safe under that warm loving light. It was then that he learned that this figure was his Father, and he was given the name Castiel.
He soon learned that he was a fledgling, he was an angel. He will learn to love and serve his Father and all of Heaven. When Gabriel first brought him down to Earth, he almost stepped on a fish. Gabriel reprimanded him for that but Castiel wasn't paying attention. He was much more interested in the little fish that defied its nature and crawled onto the Earth. It was all part of his Father's plan, of course, but the fish didn't know that. Castiel found himself becoming curious about what the fish will do next and sat down on the bench, watching it move. Gabriel realized that little Castiel wasn't listening to him, but rather watching the creature. He was pleasantly surprised that Castiel wasn't like the other fledglings, no wonder Castiel was their Father's last and most treasured. Gabriel gave up on his speech and sat down next to him, answering any questions that Castiel asked.
When Gabriel left Heaven, Castiel felt something he didn't understand. He felt as if he was in pain but he had no wounds, his grace couldn't help him. Without Gabriel to turn to, he asked his other brothers and sisters. Castiel didn't like the look on their faces when he told them this, it was as if they were disappointed and angry at him. In the end, Zachariah took him to see a seraph named Naomi and told little Castiel that she would fix it. Years turned into centuries, the little wide-eyed fledgling grew up into the perfect soldier. Quick, powerful, a warrior who will carry out his orders without hesitation. Castiel shed his little down feathers and rose up the ranks until he became the leader of his own garrison.
It was then that Michael commanded the angels to carry out their most important mission yet: rescuing the righteous man from Hell. The battles in Hell were brutal, it left burns and scars on poor Castiel that he might never recover from, but he succeeded in the mission. He found Dean Winchester by the racks, brandishing a knife and cutting into a soul marked for damnation. Castiel turned his eyes away as the shrill cries from the soul echoed through the chamber. He was disturbed that the man he was going to rescue seemed to be enjoying the pain of that soul until he approached Dean and noticed that Dean's soul wasn't corrupted by it. With every cut Dean inflicts, another cut appears on his. Dean isn't doing it for his enjoyment, it hurts him just as much to do so. This is when Castiel made his presence known. He tells Dean that he has come to save him but Dean looked at Castiel with hope and guilt, that was how Castiel knew that Dean was indeed the righteous man. Dean dropped the knife and stood there as Castiel gripped him tight and pulled Dean Winchester out of Hell.
Castiel thought that it would be the last time that he would see Dean Winchester but it seemed that his Father had other plans. Cas became Dean's charge and he even met Sam Winchester. He didn't like to recount their meeting. Though Sam seemed kind and devout, his soul and body were tainted with demon blood, Cas was unnerved and it made him question how an abomination like that could still have so much faith. It made Cas question how this could happen to Sam, to humanity.
Cas had questions and doubts about Heaven, he told Dean that much, and Heaven wouldn't give him answers. He found himself favoring the Winchesters, even helping Dean out of his own volition and disobeying Heaven's orders. When the angels pulled Cas out of his vessel, he knew that this would be his end. He knew that there would be consequences for defying Heaven, he would probably have his wings burned for this. But they didn't do that, instead, they put him in a white room with a stern-looking angel sitting at the desk. Cas didn't know what to expect from this, he asked the angel what was going to happen now. She simply introduced herself as Naomi, a name that Cas felt like he should know and be scared off. She leaned forward and told him that she was going to fix him, he didn't understand it but he was shaking.
He walked out of the office, feeling cold and empty. He knew what he had to do, he couldn't afford to go against Heaven. He never wanted to step foot in that room again. When he saw Dean again, he had to turn away from them. Castiel was an angel and he was made to serve Heaven. He was a servant to no man, especially not Dean Winchester.
Castiel couldn't look Dean in the eye when Zachariah brought him into the Green Room. He knew what this meant, Sam was with the demon heading to kill Lilith and releasing Lucifer from Hell. It took some time for Castiel to realize that Heaven had no intention of stopping the apocalypse or saving humanity, he wouldn't admit that it scared him that he was going to completely betray Heaven and his purpose. But he took Dean away from the angels and located the prophet Chuck, who was very surprised to hear Castiel challenge destiny and 'making it up' as they go. It didn't take long for Heaven to find them though as Raphael made his arrival loud and clear. With his new growing human emotions and purpose, Cas made his last stand against his family as he said to Dean before sending him to Sam.
"I'll hold him off, I'll hold them all off."
A/N: Yeah, this is much longer. Sorry Gabriel, but Cas will always be my favorite angel.
Enjoy and take care, Loves.