One common theme is friendship. The SI OC often forms a deep bond with Killua, and they go through various adventures together, relying on each other. Another theme could be self - discovery. As the OC is in a new world with Killua, they learn more about themselves.
One common theme is adventure. Since Killua is from the Hunter x Hunter world which is full of dangerous quests and exploration, many fanfictions involve the reader joining him on his adventures. For example, they might go on a journey to find a rare treasure or explore a mysterious and dangerous place.
Sure. One great fanfic could be 'The Adventures of SI OC and Killua' which explores their unique friendship in the world of Hunter x Hunter. It has interesting plot twists and well - developed characters.
You can start by looking on fanfiction platforms like Archive of Our Own (AO3) or FanFiction.net. AO3 has a large and diverse collection of Killua Zoldyck x Reader fanfictions. Just use the search function and type in 'Killua Zoldyck x Reader' and you'll get a bunch of results. Some are really well - written with great character development and interesting storylines.
Another good one is 'My Life as a Zoldyck OC'. It stands out because it delves deep into the Zoldyck family secrets from the perspective of the OC. The story is full of twists and turns, like when the OC discovers a hidden part of the Zoldyck mansion that no one else knew about.
One unique feature is the blend of two very different universes. The Naruto world is full of chakra and ninja techniques, while the Zoldyck family from another series has its own set of assassin skills and a dark, brooding family dynamic. In naruto zoldyck fanfiction, these two elements combine to create new and exciting storylines.
I think Midoriya could be his best friend. Midoriya is kind - hearted and always looking to learn, which would appeal to Killua. They could bond over their shared desire to become stronger and protect others.