There are some out there. You can try searching on fanfiction - specific websites. Some might be hidden in the depths of those archives. Just keep in mind that the concept is quite unique and might not be as common as other types of Harry Potter fanfiction.
There could be. However, not all such fanfictions might be of high quality. Some might be more focused on the shock value of the concept. But if you dig deeper, you may come across ones that handle the idea in a more creative and engaging way. For example, they might explore how such a situation would change the dynamics between Harry and Ron and their friends in the wizarding world. You really have to sift through to find the gems.
Well, often there's a theme of secrecy. Harry might be afraid of what others will think or do if they find out about his situation. There could also be a theme of protection, with his friends or some unexpected allies trying to keep him safe from those who might want to harm him because of his unique state. And of course, there's the theme of how this affects his magical education and his relationships within the Hogwarts community.
I'm not really into mpreg fanfiction, but you could try searching on popular fanfiction platforms like Archive of Our Own. They usually have a wide range of stories, and you might find some interesting 'Harry and Tom' ones there.
There's a lesser - known fanfic where Harry's mpreg is related to some dark magic that was cast upon him during his 5th year. In this story, Harry has to not only deal with the physical and emotional aspects of being pregnant but also figure out how to break the dark magic spell that caused it.
One common theme is the struggle with identity. Harry already has a lot on his plate as 'The Boy Who Lived' and now with being mpreg, he has to reevaluate who he is. Another theme is the support system. It often shows how his friends and allies in the wizarding world either step up or falter in their support for him.
I'm not sure specifically about mpreg fanfiction involving Tony Stark and Harry Potter. Mpreg (male pregnancy) is a very niche and often not part of the official canon in either the Marvel or Harry Potter universes. However, you can try searching on some large fanfiction websites like Archive of Our Own. They have a vast collection of fan - created stories, but be aware that the quality can vary greatly.
One popular 'alone mpreg Harry fanfiction' might be 'Harry's Solitary Journey'. In it, Harry is on his own dealing with the unexpected pregnancy. It shows his inner strength and how he copes without much support. Another could be 'Alone with the Miracle', which delves deep into Harry's emotions as he faces the challenges of being pregnant all by himself.
There are a variety of such fanfictions out there. However, it's important to note that mpreg (male pregnancy) is a very niche and often not part of the original canon. Some might explore the relationship between Harry and Cedric in a whole new way through this concept, perhaps delving into how their friendship or rivalry could be transformed in a world where such a thing is possible. But again, it's quite a unique take.
I'm not sure about its popularity. There are so many fanfictions out there that it's hard to gauge the popularity of just one. It might be popular among a niche group who are interested in the concept of mpreg and Harry Potter, but it may not be widely known to the general Harry Potter fanbase.
It is not appropriate. 'Lemon' is often used in fanfiction to denote sexual or adult - related themes. While fanfiction can be a great creative outlet, when it involves such inappropriate content as this, it goes against the standards of what should be acceptable in a general or family - friendly context. Even the'mpreg' aspect, while a creative take on character development, in combination with the 'lemon' aspect makes it inappropriate.