Maybe. Without knowing more about Tidy Fantastic Fiction, it's hard to tell. If the story revolves around him or if he has a major impact on the plot, then he is significant.
It depends. Novels can have various types of endings. Sometimes a tidy conclusion gives a sense of closure, but in some cases, an ambiguous or unresolved ending can add depth and mystery.
The story of Shitani was about a ronin called Minya Iemon. In order to marry Ah Yan, he killed his father-in-law who was obstructing him. Ah Yan gave birth to a son, but Iemon began to hate her. Ito's Mei became interested in Iemon and sent someone to send poison to Ah Yan, trying to marry Iemon. After Iemon learned about it, not only did he not stop it, he even agreed to Ito's proposal. After Ah Yan consumed the poison, his appearance was ruined and he died tragically. Ah Yan's spirit turned into a vengeful spirit, pestering Iemon and eventually leading to his death. This ghost story was adapted into a kabuki performance and continued to influence Japanese horror culture.
They can serve as blueprints. If a town sees another town's success in, say, reducing crime through community policing programs as in some strong towns success stories, they can adopt similar strategies.
The 'little miss tidy story' is likely about a character named Little Miss Tidy. She might be someone who loves to keep things clean and organized. Maybe she lives in a neat little house and has a daily routine of tidying up. For example, she could start her day by making her bed perfectly, dusting all the furniture, and putting away all her toys or belongings in their proper places.