The capital imitated Chang 'an, not Luoyang. Although the layout and architectural layout of Jingdou adopted the chessboard layout of Chang 'an, dividing the city into two parts, Tokyo and Xijing, Tokyo imitated Luoyang of the Tang Dynasty, and Xijing imitated Chang' an. The construction of Jingdou was based on the design and experience of Chang 'an City in the Tang Dynasty, while Luoyang only borrowed some of the names and characteristics of some of the alleys. Therefore, it could be said that the capital was built in imitation of Chang 'an.
If Naruto imitates Kakashi in a fanfiction, one aspect could be his appearance. Naruto could start wearing a mask like Kakashi does. He might also try to copy Kakashi's spiky white hair by using some sort of hair product or a transformation jutsu. In terms of behavior, Naruto might attempt to be as calm and collected as Kakashi in battle. However, Naruto's natural exuberance would likely break through at some point. He could also try to imitate Kakashi's habit of arriving late, which would be quite a change for Naruto who is usually very punctual when it comes to important things like missions or training with his friends.
In some 'usopp fanfiction', he might be the key to solving a mystery on the ship. Maybe there are strange occurrences that only his unique perspective and skills can figure out. This could involve his talent for creating gadgets and his sharp observational skills, which are often overlooked by others but prove crucial in these fictional scenarios.
One common theme is empowerment. Since Usopp is often seen as a bit of an underdog, in female Usopp fanfiction, she is often empowered to be a strong and capable character. Another theme is friendship. Just like in the original story, the female Usopp forms strong bonds with her crewmates. Self - discovery is also a theme. She may discover her own abilities and what she truly wants in life through her adventures.