Survival is also a big theme. When he is in a crossover with a more dangerous world, like a post - apocalyptic or a world full of powerful enemies, Yuichiro has to use his skills and wits to stay alive. It creates a lot of tense and exciting moments in the fanfiction.
Sure. One great piece is 'Yuichiro in Another World' which has an interesting crossover with a fantasy realm. It shows Yuichiro's character adapting to new and strange situations in that world.
I'm not that familiar with 'yuichiro hyakyua' crossover fanfiction, but often in crossovers, themes like friendship between characters from different worlds can be common. Maybe also the exploration of different powers or abilities when the characters interact.
Friendship and loyalty are also common themes. Mikaela often forms deep bonds with other characters in fanfiction, and these relationships are explored in terms of how they support and sometimes challenge her. For example, in some stories, her loyalty to a particular group might be tested. Also, the theme of survival is quite prevalent. Given the nature of the world she exists in, many fanfictions show her fighting to survive and what she's willing to do to stay alive.
One common theme is the deep emotional bond between them. Given their relationship in the original work, fanfictions often explore how they support and care for each other on a more profound level. Another theme could be adventure, where they go on quests together and their relationship develops during those experiences.
One common theme is forbidden love. Since Mikaela might be in a complex situation in the original story, a relationship with a reader - insert could be seen as something that goes against the norm or has some sort of obstacle. Another theme could be self - discovery. Through the relationship with Mikaela, the reader - insert might discover new aspects of themselves. Also, the theme of protection often comes up. Mikaela may feel the need to protect the reader - insert, and this can add a lot of depth to their relationship.
I'm not sure specifically about 'yuichiro hyakyua' crossover fanfiction. You could try searching on popular fanfiction websites like Archive of Our Own or FanFiction.net. They usually have a wide range of crossover fanfics.
In this type of fanfiction, the theme of power and its implications is likely. Yuichiro's dominance represents a certain kind of power. How he wields this power in relation to Mikaela and the world around them can be a theme. Another theme could be the exploration of boundaries. Both characters may need to figure out the boundaries within their relationship due to Yuichiro's dominance. And finally, the theme of sacrifice might come into play. Yuichiro might be more likely to sacrifice for Mikaela because of his dominant position, and vice versa.
One of the main themes is survival. In a world dominated by vampires, the characters, including those related to Mikaela Hyakuya, have to fight for their lives. Another theme is friendship. The bonds between the characters are tested and strengthened throughout the story. There's also the theme of redemption, as some characters strive to make up for their past mistakes.
One common theme is adventure. Since the Valerian universe is full of exciting and unknown elements, when crossed with other universes, it often leads to epic adventures. For example, a crossover with a space - opera like Star Trek could result in a story where Valerian and his companions explore new galaxies together with the Star Trek crew.
One common theme is the clash of different powers. For example, when the Incredibles cross with other superhero groups, there's always the exploration of how their powers compare and contrast.