One common theme is redemption. Given their past actions and the rift between them, many fanfictions explore how they can redeem themselves in each other's eyes. Another theme is forgiveness. They have to forgive each other for things like the war and the separation. For example, in some fanfics, they slowly come to understand each other's motives and forgive.
One common theme is loyalty. They are both important figures in the monster world, and stories often explore how loyal they are to each other and to their respective causes.
Another theme is redemption. Asgore might have made some mistakes in the original story, and in these fanfics, Asriel can play a role in his redemption process. It shows how love and family can be a driving force for change. For example, in some fanfics, Asriel helps Asgore come to terms with his past actions and move towards a better future. This often involves a lot of emotional conversations and growth for both characters.
Sakura could be involved. She could be like a healer or an advisor in the new world. Her medical skills would be very useful. Also, Sasuke might be there. He could be a sort of enforcer, using his Sharingan to detect threats. In the world of Asgore, they could form a new kind of team, with Naruto as the leader like Asgore. And then there could be characters from Asgore's world like Toriel. She could be a guide to Naruto about the culture and history of the place.
A 'asgore depressed fanfic' might explore the character Asgore's state of depression in depth. It could show his internal struggles, perhaps related to his past actions or the weight of his responsibilities. The fic may delve into his feelings of loneliness or regret.
Power struggles are still very common. Just like in the original, characters in the modern AU fanfics are often fighting for control, whether it's in a business, political or social setting. For example, in fanfics where they are in a corporate world, they compete for the top position in the company.
One common theme is the struggle for acceptance. A female Clark Kent often has to prove herself in a world that might expect Superman to be male. Another theme is the exploration of femininity and power. How does being female change the way she wields her superpowers? For example, she might approach situations more empathetically.
Another theme is self - discovery. High school is a time of growth, and in these fanfics, the members often learn more about themselves. They might discover new talents, like one member realizing they are great at singing or dancing during a school talent show. This theme of self - discovery is often intertwined with the themes of friendship and love as they all contribute to the overall character development of the BTS members in the high - school au.