A less common but still interesting trope is the 'demon in disguise'. The demon might pretend to be a human to get closer to the one they love. This can lead to a lot of humorous or tense situations when the truth is about to be revealed. Additionally, the 'redemption arc' for the demon can be a part of the story. Maybe the demon has a dark past, but through their relationship with the human, they strive to become a better being. This can add depth to the character and the overall story of the fanfiction.
The 'curse or spell' trope is also common. For example, a spell might bind a demon and a human together, and they have to figure out how to break it while also dealing with their growing feelings for each other. This trope can lead to a lot of internal and external conflict. Also, the 'human with special powers' trope can be used. A human might have some sort of power that attracts the demon, and this power can be the starting point of their relationship, whether it's a magical ability or some kind of psychic power.
One popular trope is the 'forbidden love' angle. Since demons and humans are different species, their relationship is often seen as something that should not be. This adds an element of excitement and danger. Another trope could be the 'protective demon'. The demon, being more powerful, protects the human from other threats in the fictional world. This can create a sense of dependence and also a power imbalance that can be interesting to explore in the context of a relationship.
The 'soul - binding' trope is also seen often. It implies a deeper connection between the two, like their souls are intertwined. This can lead to all sorts of plot developments, such as one being able to sense the other's emotions or danger. And there's the 'redemption' trope, where the demon is redeemed through the love of the human.
One popular trope is the 'forbidden love' aspect. Since vampires are often seen as dangerous and different from humans in these fanfictions, the relationship between a vampire and a human is considered taboo. Another trope could be the 'protective vampire'. The vampire may feel the need to protect the human from other threats in the supernatural world. Also, the 'transformation dilemma' is common, where the human may be faced with the choice of becoming a vampire to be with their lover or staying human and facing the challenges of a short lifespan compared to the vampire.
The 'Soulmate' trope is quite common. It implies that the dragon and the human are destined to be together, perhaps by some magical or fateful connection. This trope adds a sense of inevitability and romanticism to the story.
One popular trope could be the 'enemies - to - friends - to - lovers' arc. It starts with Ichigo and Karen Lemon having some sort of conflict, then gradually becoming friends and eventually falling in love. This trope adds drama and development to their relationship.
The 'forced proximity' trope is also common. Maybe they have to share a room during a training camp or are stuck together during a storm. This leads to them confronting their feelings for each other. And of course, the 'angst - filled misunderstanding' trope. A miscommunication between them can create a lot of drama and tension, which is then resolved as they realize their true feelings for each other.
Lemon fanfiction often involves romantic or sexual undertones in a fictional context. In demon and human lemon fanfiction, it might explore the complex relationships between these two different species. For example, it could be about a demon falling in love with a human and the challenges they face due to their differences, like cultural differences if demons have their own unique cultures, and the moral and ethical implications. It may also play with power dynamics, as demons are often depicted as more powerful than humans in many fictional universes.
One common trope is the friendship development between Sonic and Shadow in human form. In many fanfictions, they start off as rivals, much like in the original Sonic series, but as humans, their interactions take on a different flavor. They might meet in a school or a normal neighborhood setting and gradually come to understand each other better.
One popular trope is the 'fish out of water' situation. For example, a character from a medieval setting reacting to modern technology in a fanfic. Another is the 'enemy - to - lover' trope, where two characters who initially dislike each other gradually develop romantic feelings. And the 'found family' trope is also common, where characters form a close - knit family - like bond through their reactions and interactions.
One popular trope is the 'fish out of water' situation where a toon character is suddenly in the human world or vice versa. For example, a toon might struggle to understand human customs like traffic rules or school systems. Another trope is the friendship - a human and a toon becoming unlikely friends and going on adventures together, like exploring a new magical world that combines elements of both toon and human realms.
In many harem fanfictions, including potentially those with a 'Johnny Harem Lemon' theme, there might be the 'jealousy' trope. Where the members of the harem get jealous of each other's interactions with Johnny. Also, the 'protective harem' trope could be present, where they all try to protect Johnny from various threats. However, the 'Lemon' aspect might add some more mature takes on these tropes, such as more adult - themed jealous scenes, but this is speculation as it's a rather specific type of fanfiction.