The theme of growth, both for Kirito and the girls in the harem, is often seen. Kirito may grow as a person in terms of his ability to handle multiple relationships, and the girls may grow in their confidence and abilities as they are part of Kirito's life. Also, the concept of loyalty within the harem is a common theme, with the girls showing loyalty to Kirito and also to each other in some cases.
One common theme is adventure. Since they are from the Sword Art Online universe, they often go on quests together in fanfics. Another theme is love, as their relationship is a central focus. It can range from a budding romance to a deep and abiding love.
Adventure is also a popular theme. Since they are in a virtual world in Sword Art Online, fanfics may take them on new and exciting adventures that were not in the original plot.
Love and friendship are common themes. Many fanfics explore how their friendship could potentially turn into a deeper romantic relationship, like in 'Kirito and Lizbeth: The Unspoken Love'.
Another theme is adventure. Since they are in a virtual world, they often go on quests together. Fanfics will describe their adventures, like exploring new areas, fighting powerful enemies, and solving mysteries along the way.
The theme of self - discovery also pops up. As they interact with each other in the fanfics, they often discover new things about themselves, like hidden strengths or weaknesses, which in turn affects their relationship.
In the 'kirito x harem fanfic' world, 'Kirito's Harem: A New Beginning' stands out. It starts with Kirito finding himself in a new situation where he gradually forms a harem. The fanfic focuses on how he manages the different personalities in his harem. Additionally, 'Kirito and the Harem of the Virtual World' is quite interesting as it takes place in a virtual setting and shows how the harem dynamic works in that context.
One common theme is the clash of different worlds. Since Naruto is from a ninja - based world and Kirito from a virtual - world - based story, the fanfics often explore how these two different settings interact.
One common theme is the clash of different power systems. Kirito has his sword - based combat skills from Sword Art Online, while Naruto characters use chakra - based ninjutsu. Fanfics often explore how these two power systems interact when Kirito enters the Naruto universe.
Another theme could be character growth. As Takashi navigates the complex relationships in the harem, he may grow as a person. And for the harem members, they might also develop in terms of their own personalities and how they relate to Takashi. It can also involve themes of friendship within the harem, despite the romantic undertones. They might support each other in different ways while still vying for Takashi's attention. Additionally, some 'takashi x harem fanfic' may have themes related to adventure or a common goal that the group has to achieve, which further complicates and enriches the relationships.
One common theme is the growth of relationships. Deku's character development is often intertwined with his interactions with the members of his harem.