The common themes in Charlie x Alastor fanfic are numerous. For starters, there's the theme of acceptance. They are from different 'worlds' within Hell, and the fics often explore how they come to accept each other. Another is the theme of mystery. Alastor has a lot of mystery surrounding him, and Charlie is often trying to figure him out. There's also the theme of loyalty. As their relationship develops, questions about their loyalty to each other, to their own beliefs, and to the power structures in Hell come into play. These themes all add depth and interest to the fanfics.
One common theme is the contrast between good and evil. Charlie represents the more positive side, trying to redeem sinners, while Alastor is a powerful and somewhat menacing figure. Another theme is the idea of an unlikely friendship or relationship forming. Also, the power dynamics in Hell often play a role, as they both have different positions in that hierarchy.
One common theme is the idea of redemption. Charlie is often seen as trying to redeem the souls in Hell, and Alastor's presence can either help or hinder that. Another theme is the contrast between their personalities. Alastor is more of a chaotic and somewhat menacing character, while Charlie is more optimistic and kind - hearted.
Redemption is also a big theme. Since Charlie is on a mission to redeem souls, sometimes Alastor gets involved in this journey in the fanfics, either helping or hindering. And their relationship development is another key theme. How they grow to understand each other better over the course of the story is often explored in these fanfics. For example, in some fanfics, Alastor slowly starts to see the value in Charlie's ideas due to their continuous interactions.
Another theme is redemption itself. Charlie is always trying to redeem sinners in Hazbin Hotel, and in the fanfics, Alastor's character can be a part of that journey. Maybe she tries to redeem him, or he helps her in her mission in unexpected ways.
One great Charlie x Alastor fanfic is 'The Unlikely Bond'. It delves into how their different personalities start to find common ground. Another one is 'A New Beginning' which shows an interesting take on their relationship evolving in the unique setting of Hell. There's also 'Unexpected Allies' that focuses on them teaming up against a common threat in Hell.
One common theme is the clash of personalities. Alastor is very different from Angel Dust, and this often leads to interesting dynamics in the fics. Another theme is the idea of redemption or change, where they might influence each other to become better or worse.
One common theme is power dynamics. Alastor being a powerful figure in Hell, when paired with an OC, often leads to exploration of how their different levels of power or influence interact. For example, the OC might be initially intimidated by Alastor's power but then find ways to hold their own.
One common theme is friendship growth. They often show how Happy and Charlie become closer and understand each other better over time.
The theme of understanding is also quite common. Given their different personalities and the age gap, fanfics may focus on how they come to understand each other better. For instance, Bella might understand Charlie's overprotectiveness as a sign of his love, and Charlie might understand Bella's need for independence as she matures.
One common theme is friendship. Since Charlie and Maxwell are two different characters, their relationship development is often explored in fanfics. Another theme could be adventure as they can be put into various exciting situations together.
Love and acceptance are very common themes. Since their relationship is about two boys falling in love, a lot of fanfics explore how they come to terms with their feelings and how those around them accept or react to their relationship.