The theme of isolation is also prevalent. As a vampire, Dean may be shunned by his old friends or hunted by other hunters. He has to deal with being alone in a world that he no longer fully belongs to. And sometimes, there's the theme of power. His new vampire powers can be both a curse and a way to protect those he loves.
One common theme is the struggle with identity. As a vampire, Dean has to re - evaluate who he is. Another theme is the conflict between his vampiric instincts and his human morality. For example, he may be tempted to feed on humans but his human side holds him back.
One possible analysis could be that it might explore the darker sides of the characters Dean and Sam in a vampire - themed scenario. Maybe it delves into how they deal with the vampiric nature, whether they resist it or succumb to it. It could also be about their relationship dynamic changing due to the vampiric influence.
One common theme is the struggle between good and evil. Dean often has to decide whether a vampire can be redeemed or is just pure evil. Another theme is the idea of family. His relationship with Sam and how vampires can either threaten or be integrated into their 'family' unit in a strange way. Also, there's the theme of sacrifice. Dean might have to sacrifice his own safety or even his beliefs to deal with the vampire situation.
One popular Vampire Dean fanfiction is 'The Vampire's Embrace'. It delves deep into Dean's transformation into a vampire and how he struggles to maintain his humanity. The story has great character development and some intense action scenes.
One common theme is Dean's struggle with his vampiric nature. He's a hunter in the show, so becoming a vampire goes against everything he believes in. Fanfictions often explore how he deals with this internal conflict.
There's also 'Dean's Dark Descent'. In this fanfiction, Dean as a vampire has to face off against some old foes in a new and terrifying way. It's full of action and really shows how his vampirism changes his approach to hunting. Well worth a read if you like this genre.
One common theme could be the struggle between good and evil within the characters. Even as vampires, Dean and Sam might still have remnants of their former moral compasses. Another theme could be isolation, as they may be shunned by their human friends and allies due to their vampiric nature.
Some dean winchester vampire fanfiction that stands out are 'Fangs in the Night' and 'Bloodlust and Brotherhood'. In 'Fangs in the Night', Dean is lured into a vampire's trap but uses his wits to turn the situation around. It's full of action and suspense. 'Bloodlust and Brotherhood' explores the relationship between Dean and Sam when they encounter a family of vampires. It shows how their bond is tested and strengthened in the face of this new threat. There are also many others out there that are worth exploring on various fanfiction platforms.
Another option is Tumblr. There are many 'Supernatural' fan communities on Tumblr. Some bloggers share and recommend their favorite fanfictions, including those about Vampire Dean. You can follow relevant tags and blogs to discover new stories.