Some of the side characters like Shikimori's friends might also gain popularity in the fanfiction. If the fanfiction gives them more depth and interesting storylines, readers could really get attached to them. For example, a friend who has a hidden talent or a mysterious past.
Another plot could be a time - travel scenario where Shikimori goes back in time and has to deal with her past self and the challenges that come with it. This could add a whole new layer of complexity to her character.
The unique characters make it popular. Shikimori herself is a very interesting character with her cool and cute sides. Her relationship with her boyfriend is also quite charming, full of sweet and funny moments.
The story is about a relationship. Shikimori's boyfriend often gets into some small troubles, and Shikimori is there to save the day with her unexpected coolness. It also shows their daily life at school and with friends, filled with warm and humorous moments.
It depends. If you're the author of the story, and it's in a format that permits editing, such as a text file on your computer or an online writing platform, then of course you can. But if it's a story that belongs to someone else and is under copyright protection, you can't legally edit it without permission.
The ending of the Shikimori manga is quite satisfying. The main characters reach a conclusion that feels right for their journey, and loose ends are neatly tied up.
It could mean that something or someone is not in the category of being cute but rather has a 'psycho' or wild, unpredictable nature related to the style of pulp fiction. Maybe it's about a character in a story who is not endearing in a typical cute way but has a more edgy and crazy personality like those often found in pulp fiction stories.