One great Saving Grace Supernatural fanfiction is 'The Hunter's Redemption'. It delves deep into the relationship between the main characters and adds an interesting twist to the Supernatural lore. Another one could be 'Grace Unveiled' which focuses on the power of grace in a unique way within the Supernatural universe.
Love is a very common theme. The complex and often unrequited love between Dean and Anna is explored in many fanfictions. For example, how their different natures, Dean being a hunter and Anna being an angel, can both attract and create obstacles for their relationship.
The theme of identity is also important. Dean is constantly struggling with his identity as a hunter, a brother, and a son. Anna, on the other hand, may be dealing with her identity as an angel who has fallen or is on the verge of falling. In fanfiction, their relationship can help them both come to terms with who they are. For instance, through their interactions, Dean might learn to accept the parts of himself he's been denying, and Anna might find a new purpose in her existence that is more in line with her true self.
In Supernatural fanfiction, the relationship between Dean and Anna can be complex. Sometimes it's a deep emotional bond. Dean, with his tough exterior, might find in Anna a kindred spirit. She, being an angel, has a unique perspective that could either clash or complement Dean's more earthly views.
You can start by looking on popular fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions, and you can easily search for Saving Grace Supernatural fanfictions using the search bar. Just type in the relevant keywords, and it should bring up a list of stories.
One possible plotline could be an archangel struggling to survive in the human world without their grace. They might have to learn how to do things the human way, like getting a job or finding shelter. For example, Michael could be stripped of his grace and end up working at a diner, trying to figure out how to blend in.
One idea could be a story where a character is given a second chance at life by the grace of God. For example, a hunter who was killed comes back to set things right in the Supernatural world. Another could be a situation where God's grace is used to purify a demon instead of just exorcising it, leading to a whole new kind of relationship between the hunters and the reformed demon. Maybe God's grace could also be the key to opening a portal to a dimension where all the lost souls of hunters are trapped, and the main characters have to rescue them.
One great 'Dean Anna Supernatural' fanfiction is 'Anna's Redemption'. It focuses on Anna's journey and her complex relationship with Dean. The story delves deep into her character, showing her struggle between her angelic nature and her feelings for Dean.
Well, obviously the archangels like Michael, Lucifer, and Gabriel are often main characters. Michael is usually portrayed as a very powerful and somewhat rigid character, so seeing him without his grace can be a really interesting transformation. Lucifer, on the other hand, is always a complex character, and his actions when he loses his grace can be very unpredictable.
You could have a character who is an atheist suddenly experience a moment of 'by the grace of God'. For instance, they are about to be killed by a powerful supernatural being, and then a mysterious force saves them. They then start to question their beliefs and explore the role of God in the Supernatural world. It would add an interesting character arc.