Well, a frequent theme is probably Romano's isolation. The bullying might make him feel alone in high school. There could also be a theme of transformation. He could start off as a shy, victimized person and gradually grow stronger and more confident. And of course, the theme of school environment and its role in the bullying. It might show how the school either fails to stop the bullying or eventually steps in to help Romano.
One common theme could be Romano's struggle to overcome self - doubt. Because of the bullying, he might constantly question his worth. Another theme could be friendship. Maybe there's a character who comes to his rescue and they form a strong bond. Also, the theme of standing up against the bullies is likely. Romano might find the courage within himself to face those who bully him.
Common themes in such a fanfiction could include Romano's internal conflict. He may be torn between fighting back and just enduring the bullying. Another theme could be the discovery of hidden strengths. As he endures the bullying, he might realize he has strengths he didn't know about before. Additionally, the theme of family support or lack thereof could play a role. If his family is unaware or unhelpful, it adds to his struggle; if they are supportive, it can be a turning point in his fight against the bullies.
One potential ally could be a new student at school. This new kid might see what Romano is going through and decide to be his friend and stand up to the bullies. Another could be a teacher who finally notices the bullying and takes Romano's side.
Some fanfictions may have the theme of resilience. Romano could show great strength in the face of bullying, not letting it break him completely. There might also be a theme of finding one's voice. He could start off being unable to stand up for himself but gradually learn to speak out against the bullies. And the theme of change is possible too. The bullying experience could cause Romano to change his behavior or attitude either for the better or the worse.
Another theme could be historical trauma. Given their historical relationship, Spain's past actions during colonization or political control might be explored in fanfiction, with Romano still carrying the emotional scars of those times. This can manifest as Romano feeling hurt by Spain's presence or reminders of the past.
One common theme is family. Since Hetalia has a strong focus on national personifications, in the female Romano fanfictions, family relationships like her connection with her 'brother' (if the concept is carried over) are often explored.
A very common theme is the adaptation to a different gender role. Since Romano is usually male in the original, when fanfiction makes her a girl, it often explores how she copes with the new identity. This could involve changes in her behavior, her interactions with other characters, and how she is perceived in the Hetalia world. For example, she might face different expectations or challenges compared to her male counterpart, and the fanfiction could delve deep into these aspects, creating interesting storylines.
One common theme is the concern and protectiveness of Romano towards the pregnant reader. He might be shown as being extra careful and attentive.
A common theme is the cultural differences between Romano and the male reader. Since Romano is from a specific cultural background in the Hetalia universe, exploring how he and the reader interact with these differences can be really interesting.
One common theme is the girl's journey of self - discovery and empowerment. She might start off feeling weak and victimized but gradually finds her inner strength. Another theme could be friendship. New friends might come into her life to support her and help her stand up to the bullies. And sometimes, there is a romantic sub - theme where a boy might be attracted to her because of her unique qualities and then help her deal with the bullying situation.
One common theme could be the power dynamics. It might explore how the bullied Sakura overcomes the situation and grows stronger. For example, she could find inner strength and use it to face her bullies. Another theme could be friendship. Characters might come to her aid, showing the importance of having support in tough times.
Often, there's the 'opposites attract' trope in these fanfictions. For example, the bullied victim who is shy and introverted might get married to a confident and outgoing person. And there's the 'healing power of love' trope where the love between the two characters heals the emotional wounds of the bullied victim.