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.
A theme that's also quite prevalent is the idea of helping Killua overcome his family - related traumas. The Zoldyck family has a dark and complex history, and in fanfictions, the reader can play a role in helping Killua deal with his past, whether it's his relationship with his parents or his training as an assassin. This adds a layer of depth to their relationship and the overall story.
One common theme is adventure. Since Killua is from the Hunter x Hunter universe which is full of dangerous quests and exploration, many 'killua zoldyck x oc fanfiction' stories involve the OC joining him on these adventures. Another theme is friendship evolving into love. The OC and Killua start as friends or allies and then their relationship deepens over time.
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.
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.
One common theme is growth. The reader often starts off as a relatively inexperienced character, and through their interactions with Killua, they grow both in terms of their skills as a hunter and in their personal relationships. For example, they might learn how to better control their nen abilities with Killua's help.
Well, a very frequent theme is the exploration of power dynamics. Given Illumi's powerful and somewhat intimidating nature, the fanfictions often look at how the OC fits into that power structure. It could be that the OC is weak at first and has to grow to be on par with Illumi, or the OC might have a unique power that changes the balance. Also, love and redemption are common themes. The OC might bring out a sense of redemption in Illumi, or they might fall in love in a rather complex and interesting way considering Illumi's character.
One popular 'killua zoldyck x oc fanfiction' is 'A Hunter's Bond'. It focuses on the relationship between Killua and an original character. The story develops their bond through various adventures in the Hunter x Hunter world. Another one is 'Killua's New Companion' which shows how the OC impacts Killua's growth and decisions.
Love and loyalty are themes that are often explored as well. It's not always romantic love, but a deep, unwavering loyalty that might exist between them. Some fanfictions show how, despite their differences, they would still be there for each other in difficult situations, like when facing a common enemy or dealing with the challenges within their family.
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.
The appeal of 'Killua Zoldyck crossover fanfiction' lies in the fact that it combines Killua's unique character with different universes. His assassin skills and complex personality can create new and exciting storylines when put into other worlds.
One common theme is the exploration of power dynamics. Hisoka is much more powerful than Gon and Killua at first, so fanfics often play with how they either try to overcome this gap or how Hisoka uses his power in relation to them.