We should avoid focusing on the 'lemon' aspect as it may involve improper content. For regular Kancolle - Ushio fanfics, one characteristic could be the blending of different story elements. Kancolle has its own lore with shipgirls, and when Ushio is introduced, the fanfic might explore how his character meshes with this world. It could also play with different genres, such as adventure or mystery, while still staying true to the core identities of the characters from both the Kancolle and Ushio concepts.
Little crybaby princess was referring to Yang Ying's nickname in the TV series " A Thought at Mt. Guan." At the beginning, she presented the image of a typical little princess, delicate and lovely. However, as the plot developed, she experienced a dramatic change. From a weak girl, she gradually grew into an empress full of power, wisdom, and courage. Her character had gradually changed from fragile and helpless to tenacious and persistent. She had experienced betrayal and disappointment in the cracks between love and power, but she was still able to stand up with tenacity. Yang Ying's character was layered and deep. In the play, she disguised herself as a man and invited herself to be an envoy, showing her wisdom and courage. In the end, she successfully turned the tide and became the empress of a generation.
One common theme is friendship. Ushio and Tora have a very special bond, and many fanfictions explore how this friendship grows and endures through different situations. Another theme is adventure. They often go on various quests in the original work, and fanfictions expand on these adventures.