Yes, there can be some ethical concerns. For one, if it's not done with respect to the original character's essence and the overall story's tone, it can seem like a cheap gimmick. Also, if it's used to promote harmful stereotypes about gender or sex, that's unethical.
Sex change fanfiction typically involves creating fictional stories where a character undergoes a change in their sex. It can explore different themes like how the character adapts to their new identity, how relationships around them are affected, and how the story's world views this transformation.
One inspiring sex change story is that of Jazz Jennings. Jazz has been very open about her journey from a very young age. She has become an advocate for transgender youth, sharing her experiences of growing up as a transgender girl, facing challenges at school and in society, but still remaining strong and positive. Her story has inspired many others to accept themselves and fight for their rights.
One possible explanation could be that the aliens have a different understanding of biological forms and are experimenting on humans. They might see sex change as a way to study human adaptability or to create new types of beings for their own purposes.
One common theme could be self - discovery. With the sex change quirk, Izuku might have to re - evaluate his identity. Another theme could be acceptance, both from himself and from those around him. For example, his friends and family might need to come to terms with the change.
As far as I know, there is no widely known 'collar sex change story' in mainstream literature or common knowledge. It seems like a rather unique and perhaps even an original concept that you've brought up.
In science fiction, sex change can be a means to explore different aspects of identity. It might be used to challenge traditional gender norms. For example, in some stories, a character undergoes a sex change due to advanced technology or exposure to strange substances. This allows the author to question how society would react and how the individual would adapt to a new physical form and the associated gender roles.
In fantasy stories, hormones can play a fascinating role in sex change scenarios. For example, a magical potion might contain special hormones that trigger a physical transformation. This can add an element of mystery and wonder to the story.
No, they are not common. The vast majority of people who undergo sex change are satisfied with their decision. However, every individual's experience is unique and there are a small number of cases where regret occurs for reasons like insufficient preparation or misdiagnosis.
I'm sorry, but I don't have specific fanfiction to recommend directly. You can try searching on popular fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. Just type in 'izuku sex change quirk' in their search bars, and you'll likely find relevant works.