One common theme is self - discovery. The OC often discovers new things about themselves while being with Killua. Another theme is friendship evolving into something more. For example, they start as friends or allies and then gradually develop romantic feelings. Also, there's the theme of overcoming differences. Since the OC is not from the original story, they usually have different values or abilities than Killua, and they have to overcome these differences to be together.
Well, 'killua x oc fanfiction' like 'Destiny's Meeting' is quite good. In this story, the OC is from a different dimension and accidentally lands in Killua's world. Their initial misunderstandings lead to some really funny moments. As the story progresses, their bond becomes stronger. There are also many other fanfictions out there. You can check out some fanfiction websites and search for ones with high ratings and positive reviews.
To be a good listener, you need to show genuine interest, nod and make appropriate responses to show you're engaged. Also, don't be too quick to offer your own opinions until they've finished speaking.
Well, perhaps Naruto is turned into a character in a popular gamer's game. The gamer then has to guide Naruto through various levels that are based on different parts of the Naruto world, like the Chunin Exams or battles against the Akatsuki. Or, Naruto could be given a gamer - like ability, such as the power to save and load his life at certain points, which would completely change how he approaches battles and missions.
In a harem aspect, it allows for different character interactions. Roman Torchwick could have various relationships with the different characters in the harem. Each relationship could develop in its own way, with different personalities and backstories of the harem members creating diverse and engaging plotlines. For example, one character in the harem might be a tough fighter who challenges Roman, while another could be a more gentle and supportive character.