Fanfiction.net is also a good place to search. There are many different categories and you can narrow down your search to find the 'rohan x josuke' fanfiction you're interested in. However, the quality can vary, so you might need to do some sifting through the results.
I Refuse to Go to the Village is a novel written by Xiao Yi. The protagonist of the story, Qiu Qiu, accidentally transmigrated into a book and found himself in the seventies. She became an educated youth who was abandoned by her parents and went to the countryside. In this story, Qiu Qiu worked hard and was unwilling to go to the countryside. Through her own hard work and wisdom, she gradually changed her fate. The latest chapter of this novel was the end of chapter 130, which was already finished.
Fanfiction.net is also a popular place. There are many fanfic writers who contribute to the Josuke x Rohan category there. However, the quality may vary, so you might need to read a few to find the really good ones. Some might be more focused on their friendship, while others could explore a romantic relationship between them.
Some popular ones could be 'Sword of the Rohan' which is known for its epic battles and complex characters. Another might be 'Rohan's Quest', a story full of mystery and adventure.
There could be multiple factors. His role models, whether they were his teachers, older siblings, or people he read about in books, might have inspired him. Also, the realization that hard work brings rewards, like good grades, praise from others, and a sense of accomplishment, would have made him keep up his hardworking attitude.
Rejecting the Saintess was a fantasy web novel. The author was a money tree. The story described the main character, Ji Yunshan, who had transmigrated to the Big Dipper Continent and became the direct descendant of the Ji Family's Patriarch. He was also engaged to the Feng Family's Patriarch. However, Ji Yunshan chose to reject the marriage, which triggered a series of story plots. The specific plot and development required reading the full text of the novel.
Here are a few recommended novels that refuse to be villains (closed):
1. "But I Refuse to Transform the Villain": This novel tells the story of the protagonist, Jiang Xuan, who transmigrated and became the villain. He embarked on the path of redemption and raised a little villain, but in the end, the villain became his stumbling block and stabbed him to death. After Jiang Xuan's rebirth, he had entered the world's major sects with a new identity and lived an idle life. This novel was written by Eternal Glacier.
2. "Refusing to be the villain's bootlicker at the beginning of the game, the female protagonist panicked!" The main character of this novel was Gu Yunyan Anran. She told the story of her refusal to become a villain and bootlicker. The novel was set in the city and depicted a beautiful and pure love story. This novel was written by Qingfeng and White Horse.
3. [Villain Refuses to Be Cannon Fodder (Transverse Book)]: The main character of this novel is Yun Xinzhao, and it tells the story of her refusal to become cannon fodder. The theme of the novel was to travel through time and space, bringing the readers a happy reading experience. This novel was created by a homonym.
Please note that the novels recommended above have all been completed and can be exempted from reading.