Well, it depends on the type of fanfiction. If it's a romantic fanfiction about him, he might be really embarrassed. But if it's an adventure - type fanfiction that expands on the battles and quests in his world, he could gain some new perspectives on his own experiences. He may also start to understand how the fans view his character and the world he inhabits in a whole new way.
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.
A bit. Given that he is part of the 'official' narrative, fanfiction can be really out - there. It might seem odd to him that fans have taken his character and put it in all sorts of situations that may not be in line with what he knows. However, he might also find it interesting to see the different perspectives on his character.
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.
Another excellent fanfiction is 'Heaven's Gatekeepers'. This one plays with the idea of their roles in the grand scheme of things in the Supernatural universe. It has a great plot that weaves in and out of canon events, and the way it portrays Dean and Castiel's connection is both unique and captivating.
One great 'Castiel and Reader Fanfiction' is 'Heavenly Bonds'. It beautifully depicts the relationship between Castiel and the reader with a lot of emotional depth. Another one is 'Angelic Encounters' which has some really interesting plot twists. 'Castiel's Devotion' is also a popular choice as it shows Castiel's unwavering loyalty to the reader in various challenging situations.
One great aspect of Castiel and Dean in fanfiction is their dynamic. Their relationship, which is complex in the show, can be explored even further in fanfictions. Writers often delve into their unspoken bond, creating scenarios where they support each other in ways not shown in the original series. For example, some fanfictions might have them going on a road trip together just for the sake of exploring new places and having deep conversations about their pasts and futures.
Fanfiction about Castiel in Supernatural can be really interesting. Some 'hopeless' fanfictions might focus on his often tragic or difficult situations in the show. They could explore his loyalty to Dean and Sam even when things seem truly hopeless for him. Maybe it's about his struggle with his angelic nature and the chaos of the human world he's thrown into.
There's also 'Wings and Hunters'. This one is unique as it focuses on a different aspect of their relationship, almost like a what - if scenario. It imagines a world where their connection is tested in ways that are both exciting and heart - wrenching. The story has a great flow and the descriptions are vivid.
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.