Edward could be a great character to pair with Female Envy. Their interactions would be full of tension and conflict, given their different natures. Edward's strong sense of justice and Envy's devious ways would create a lot of interesting scenarios.
One popular theme is the exploration of Envy's complex personality in the crossover. Since Envy is a homunculus with deep - seated issues like envy (obviously), in a crossover, it could be interesting to see how that plays out against new characters or new settings from the other fandom. Another theme could be the struggle for power. Envy often desires power in the Fullmetal Alchemist universe, and in a crossover, this could be magnified or redirected depending on the nature of the crossover. Also, themes of redemption are possible. Despite being a villain, Envy has moments of self - realization, and a crossover could explore if and how Envy could be redeemed in a different fictional context.
One interesting plotline could be Envy's relationship with other female characters in the Fullmetal Alchemist world. Maybe she forms an unlikely alliance with a female alchemist. This could lead to a journey of self - discovery for Envy as she experiences different emotions through this new connection.
Another reason is the 'forbidden' aspect of their relationship. Envy is a Homunculus, and Ed is a human alchemist. In the world of Fullmetal Alchemist, such a relationship would be frowned upon. But in fanfiction, this taboo nature makes it all the more exciting to explore. It allows writers to break the norms of the original story and create unique and interesting storylines that involve the two characters defying the odds and coming together in different ways.
One great Envy x Ed fanfiction is 'The Unlikely Bond'. It explores how their complex relationship could develop in an alternate universe. The story delves deep into their characters, showing how Envy's envy (pun intended) towards Ed's humanity could turn into something more. It has some really interesting dialogue that stays true to their personalities from the original series.
Writers should first understand the core characteristics of Envy. Know that Envy is a very vengeful and envious character. So, when creating a crossover plot, make sure Envy's actions are driven by these traits. For example, if the crossover is with a fantasy world where there are powerful magical items, Envy might be envious of those who possess them and try to take them. Also, keep the rules of both universes in mind. If in the other universe, magic has certain limitations, don't break those rules when Envy interacts with it. This will make the plot more believable.
There might be such fanfics in the vast world of fanfiction, but it goes against the original canon of the 'Fullmetal Alchemist' series as male pregnancy is not a part of the normal story. However, some fanfic authors like to explore very unconventional and out - of - the - box ideas.
Another theme could be Envy's relationship with other Homunculus. Writers can create stories about their power dynamics, rivalries, or even unexpected alliances in a family - friendly way. It can be really interesting to see how Envy interacts with Lust or Gluttony in different scenarios.
Some characters might be quite shocked or amused if they could read fanfiction about their own story. For example, Edward Elric would probably be very indignant at some of the out - of - character portrayals of himself. He's a proud alchemist and seeing himself depicted in a way that doesn't match his self - image would surely make him fume.