Another theme might be adventure. If they are in a particular fictional world, they could go on adventures together, and the fanfiction could detail their experiences during those travels. For example, they might face various challenges and overcome them as a team.
One common theme could be love and friendship. Since they are two characters, the fanfiction might explore how their relationship develops in terms of these emotions.
The theme of self - discovery can also be present. As they interact with each other, they may learn more about themselves. Maybe Hotaru helps Utakata understand his own powers better, or Utakata helps Hotaru become more confident. This kind of growth within the characters can be a central part of many utakata x hotaru fanfictions.
Chapter 482, "Someone Might Need Me", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event. Early on, Other people caught a glimpse of Zhao Lang's cold and stern face and.... By the end, In a moment, General Dino's face appeared on the large screen..
Chapter 870, "She is My Ex-Girlfriend", is the clearest early answer because it turns Xiao Xue's situation into a concrete plot event. The chapter gives readers a real answer by opening on Huo Shan couldn't believe it and covered her mouth in shock.
Chapter 619, "The Feast of Fish CP Is Indeed Real!", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. The chapter turns that into something concrete by moving from The storm grew fiercer until, at last, even the live broadcast had to...
A practical answer is Chapter 2, because it turns the idea into a concrete scene. The chapter opens with On the top floor of the Financial Building, a gathering of dark clouds..., adds pressure through In my opinion, Mother should kick out this troublemaker who's a stranger., and ends on Jiang.
Chapter 816, "Don't Take Them Seriously", is the clearest early answer because it turns Mom's situation into a concrete plot event. The setup is Unexpectedly, they didn't cry or fuss;
Chapter 637, "Does President Shang Know That His Own Family Is Already Bankrupt?", is the clearest early answer because it turns Shang Shaojing's situation into a concrete plot event.
Chapter 705, "Is She Her Own Destined Noble Person?!", is the clearest early answer because it turns Bai Lu's situation into a concrete plot event. A useful checkpoint is the way the scene starts with He Wen was made to laugh by Bai Lu. and follows through with So he's just a side character, huh..
Chapter 840, "How did you meet Miss Jiang?", is the clearest early answer because it turns Gu Qiang's situation into a concrete plot event. The chapter turns that into something concrete by moving from Jiang Li seemed surprised that she would suddenly speak, paused for a...
Chapter 578, "Eight Men Sit in Your Lap and You Don't Flinch at All?", is the clearest early answer because it turns Let's situation into a concrete plot event. The chapter gives readers a real answer by opening on This is ten thousand points we're talking about!" "Didn't you read...
Chapter 502, "Let Shaobai Follow Along", is the clearest early answer because it turns Shen Ruobing's situation into a concrete plot event.