One common theme is the power struggle. Given that Rin is a powerful exorcist and Amaimon is a demon, there's often a tug - of - war between their powers and how they deal with it in their relationship. Another theme could be the exploration of their different natures, with Rin being half - human and half - demon and Amaimon being a full - fledged demon.
Well, another option could be Tumblr. There are many fanfic writers who post their works there. Just search for 'Blue Exorcist Amaimon x Rin' on Tumblr's search bar and you might come across some great fanfictions. Also, some Reddit communities dedicated to Blue Exorcist might also have links or discussions about such fanfictions.
I really like the fanfic 'Rin and Shiemi: A New Chapter'. It starts off with them going on a mission together. In this story, they have to rely on each other more than ever. It has some really cute moments where Rin tries to protect Shiemi in his own clumsy way, and Shiemi in turn helps Rin understand his powers better.
Well, there could be a fanfic where Lucifer forms an unexpected alliance with an exorcist. This alliance could be born out of a mutual understanding of a greater threat that is looming over both the demon and human worlds. They have to put aside their differences and work together, which makes for a really exciting story.
One common theme is the growth of their relationship. It often starts as a friendship and gradually develops into something more. Another theme is the acceptance of Rin's true nature. Shiemi is often there to support Rin as he comes to terms with his demon heritage.
You can try fanfiction.net. It has a large collection of fanfics from various fandoms, including 'ao no exorcist', so there's a good chance of finding some great lucifer - related fanfics there.
The Ao no Exorcist light novel is interesting in terms of its exploration of moral and ethical issues. As exorcists fight demons, they often have to make difficult decisions. Is it okay to kill a demon that was once a human? These kinds of questions are raised throughout the story, adding depth to the overall narrative.
The unique demonology in Ao no Exorcist light novel sets it apart. It has a very detailed and distinct set of rules and types of demons. In comparison to other similar novels, it also focuses more on the internal struggle of the main character, Rin. His dual nature as a half - demon and an exorcist is explored in great depth.
Well, the theme of the extraordinary in the ordinary is quite common. The OC might seem ordinary at first, but there's something special about them that Amaimon notices. There's also the theme of protection. Amaimon, with his powers, often finds himself in a position to protect the OC. And the theme of self - discovery for both characters as they learn more about themselves through their relationship with each other.