One common theme could be friendship. Their bond might be explored in different ways, like how they support each other through difficult times.
Love and romance can also be a common theme. Writers might imagine a romantic relationship between them and write about their courtship and how they deal with relationship issues.
I'm not sure which specific 'chii y hideki fanfic' you might like. But you can start by looking on fanfiction platforms like Archive of Our Own. They usually have a wide variety of fanfics for different fandoms.
Love and relationship development is a very common theme. Most fanfics focus on how Harry and Ginny's relationship grows, from initial attraction to deep love.
The theme of destiny often plays a role. Many fanfics portray Serena and Darien as being fated to be together. Their relationship is seen as something that was meant to be from the start. This gives an air of inevitability to their love story and adds an element of magic and wonder. There are also themes of redemption in some fanfics, where one of them has to atone for past mistakes and their relationship is part of that journey.
Love and acceptance are big themes. In many fanfics, Alec has to come to terms with his feelings for Magnus, a warlock, which goes against what he has been taught as a Shadowhunter. Also, there is the theme of sacrifice. Sometimes one of them has to sacrifice something for the other's safety or well - being, which really shows the depth of their love.
Another theme could be growth. They often start from a certain point in their relationship and grow either as individuals or as a pair. For example, in some fanfics, they learn new skills or overcome personal fears while being with each other. This is a great way to show their development. It can also be related to the theme of self - discovery as they figure out more about themselves in the context of their relationship.
Love or romance is also likely to be a common theme. The relationship between Candy and Terry, whether it's a budding romance or a long - standing love, might be central to many fanfics. Another possible theme could be growth. They could be growing as individuals while being in each other's lives, learning from their experiences together.
Love is a very common theme. Their love story is often explored in different ways, like how they overcome obstacles to be together. Another theme is sacrifice, as both characters in the original work are known for their willingness to sacrifice for each other.
One common theme is mentorship. Anko often takes on a role of guiding Naruto in different ways, whether it's about combat or understanding the shinobi world better. Another theme is the exploration of their unique relationship. Since they are not the most obvious pairing in the original series, fanfics like to play around with how they interact and support each other.
Another theme is the exploration of their individual growth within the relationship. For example, Naruto may grow in his understanding of relationships while Ino might grow in her confidence as they get closer. It's about how they change and become better versions of themselves because of each other. And sometimes, there's also the theme of overcoming obstacles together, like dealing with the opinions of their friends or the demands of the ninja world.
One common theme is loyalty. Given their status as Saiyans, loyalty to their race and to each other is often explored. Another theme could be survival, as they live in a rather harsh universe. For example, they might have to fight against powerful foes together to survive.