Well, Castiel was created as an angel in the celestial realm. He was part of the angelic hierarchy and followed the commands of the archangels for a long time. But when he was tasked with interacting with Dean and Sam Winchester, he began to see the complexity of the human world and the gray areas in the so - called divine plans. This led to his gradual deviation from the traditional angelic path and his own exploration of what it means to be good and just.
Dean Winchester is often a common character. Since he has a strong bond with Castiel, he might be involved in the time - travel events either directly or through Castiel's actions in the past that affect him in the present.
One interesting plotline could be Castiel going back in time to prevent a major disaster in the past that has far - reaching consequences for the present. For example, he might stop a powerful demon from making a deal that would later lead to the death of many hunters.
If we're talking about Castiel from 'Supernatural', his story is complex. He is an angel who rebels against Heaven's orders. He becomes involved with the Winchester brothers, Sam and Dean, and helps them fight various supernatural threats. He has his own journey of self - discovery, dealing with his loyalty to Heaven, his newfound friendships with humans, and the struggle between good and evil in the context of the show's universe.
In a Castiel love story, he might have met a soul who understood his complex nature. She didn't fear his angelic powers but rather embraced them. They shared many evenings just talking about life, the universe, and everything in between. Their love grew slowly as Castiel learned what it truly meant to care for someone on a deeply emotional level. He would do anything to keep her safe, and she, in turn, loved him for who he was, not just what he could do.
Castiel's relationship with his powers might also change. He may have to limit his use of angelic powers to protect the unborn entity. This can cause internal conflict as he is used to using his powers freely. At the same time, it can also show his growth as a character, as he is willing to sacrifice some of his power for the sake of something new and precious.
Harry Potter himself would be very interesting. Castiel could be intrigued by Harry's connection to Voldemort and his role as the 'Chosen One'. He might offer Harry some unique insights from his angelic knowledge about dealing with dark forces, which could be different from what Dumbledore has taught him.
In dean - castiel relationship in such fanfiction, there's often a deep emotional connection. They might show a side of extreme vulnerability towards each other. Their relationship can be intense, with a lot of passion and a sense of 'destined to be together' kind of feeling.
Yes, there are likely some Naruto and Castiel fanfictions out there. Fanfiction writers often like to combine different fandoms in creative ways. You can try searching on popular fanfiction websites like Archive of Our Own or FanFiction.net to find such works.