Well, often in spiderman mpreg birth fanfiction, a common theme is the adaptability of Spider - Man. He has to adapt to a situation that is completely out of the ordinary for him. There could also be themes related to the medical aspects of this unusual pregnancy, like how it affects his powers, if at all. And of course, the theme of the mystery around how this male pregnancy occurred in the first place can be a big part of the story, leading to various plot twists and turns.
Common themes in such fanfiction may include the challenges of hiding the pregnancy from the public and his enemies. Spider - Man is a public figure, and a male pregnancy would be a huge secret to keep. Another theme is the internal conflict within Spider - Man himself. He may question his own masculinity or his role as a superhero during this time. Additionally, themes related to the new life that is coming, such as his hopes and fears for the baby, can be quite prominent in these stories.
One common theme could be the exploration of new relationships. For example, how Spider - Man's relationships with other characters change when he is in a situation of male pregnancy. Another theme might be the struggle with his superhero identity. He has to balance being a superhero and dealing with the physical and emotional changes of pregnancy. Also, the theme of support from his friends and family (or lack thereof) could be explored.
One common theme could be the struggle of Spiderman dealing with the unexpected situation. Another might be the support or lack of it from the other Avengers.
One common theme is the exploration of the characters' relationships in a very different context. For example, how the other Avengers react to the pregnancy situation. Another theme could be the challenges the pregnant character faces, like still being part of the superhero team while dealing with the physical and emotional aspects of pregnancy.
One common theme is the struggle against vampire nature. Since vampires are often seen as not being able to reproduce in the traditional sense, the mpreg goes against this norm, leading to internal and external conflicts.
Well, a usual theme is the struggle. In mpreg painful birth fanfiction, the struggle of the character to come to terms with the unexpected pregnancy is common. And then there's the pain aspect during birth which is often described in detail, showing the character's endurance. Plus, the theme of new beginnings after the birth can also be seen, as the character embarks on a new chapter of life with a new family member.
In tony stark mpreg birth fanfiction, a frequent theme is the adaptation to the new situation. Tony, being a genius and used to being in control, now has to deal with a body that is going through something completely out of his expertise. Also, the theme of protection often comes up, both him protecting the unborn and others protecting him.
In Severus Snape mpreg birth fanfiction, a recurring theme is the exploration of relationships. His relationship with the other characters, such as his friends or former enemies, may change. For instance, some might be more sympathetic than he expected, while others might shun him. Additionally, the theme of motherly/fatherly instincts in Snape is often explored, as he has to adapt to a role that is very different from his usual self.
A prevalent theme is the support system around Harry. His friends and allies play important roles in helping him through the pregnancy. It could be Hermione providing magical knowledge or Ron being there for moral support. Also, the theme of new beginnings associated with the birth during summer is often seen.
One common theme is the exploration of the character's reactions to the unexpected pregnancy. How they deal with the physical and emotional changes is often explored.
I'm sorry, but the concept of male pregnancy (mpreg) is often not in line with the traditional Spider - Man canon and may involve some rather unorthodox and not widely - accepted interpretations. However, you can try searching on some specialized fanfiction websites like Archive of Our Own. There might be some works related to unique and creative takes on Spider - Man's story that could be somewhat in the vein of what you're looking for.
One common theme could be the exploration of new relationships. For example, how the characters around the pregnant one react and support. Another theme might be the challenges faced during the pregnancy in the Inuyasha universe, like dealing with demons or magic while being pregnant. Also, there could be themes related to the future of the child and how it will fit into the existing world of Inuyasha.