There's a fanfic where child Peter Quill discovers an ancient artifact on Earth. In this story, he starts to show his natural curiosity and his penchant for adventure even at a young age. It's really interesting as it also weaves in some of the alien cultures that he would later encounter in a very subtle way.
One common theme is his sense of loss. Since he lost his mother at a young age in most fanfics, it becomes a central part of his character development. Another theme is his dreams of something bigger. Even as a child, he's often depicted as having a longing for a world beyond his small town on Earth.
I really like 'The Adventures of Peter and Yondu'. This fanfic takes them on a new adventure, full of action and humor. They face new enemies and challenges, and in the process, their bond grows even stronger. It's a fun read that stays true to their characters.
The child in fanfiction could potentially have some sort of special power. Maybe it could inherit Peter's ability to hold an Infinity Stone (if we consider that as a latent power) and Gamora's enhanced physical abilities. It would be raised in a universe full of danger and wonder. It could befriend the other Guardians and learn from them. This child might also struggle with the legacy of its parents, having to live up to their great reputations while also carving out its own path in the galaxy.
He might meet his old friends from before he left Earth. People he used to hang out with, like schoolmates or neighbors. They could be shocked to see him after all this time and how much he has changed.
Another theme is friendship or romance. Many fanfics explore the relationship between the female character and Peter Quill. It could start as a friendship based on mutual respect for each other's skills, and then develop into something more romantic as they share more experiences.
Yes, there might be some out there. You could try searching on fanfic platforms like Archive of Our Own. Some fanfics might explore their relationship in a new light with the idea of Gamora being pregnant, perhaps delving into how they would prepare for a new life together, or how it would change their dynamic within the Guardians of the Galaxy group.
No, Peter Quill isn't a Celestial in the comics. He has a different origin and set of powers.
It could have a huge impact. If it inherits the best qualities of both parents, it would be a force for good. It might be able to unite different species in the galaxy, just as the Guardians did. The child could bring a new sense of hope and inspiration.
One interesting aspect in Peter Quill's father fanfiction could be exploring his father's origin. Maybe in some fanfictions, his father is from a more complex and mysterious planet than what was shown in the official story. This can add depth to the whole Guardians of the Galaxy lore.
One possible plot could be that they discover Gamora is pregnant while on a mission. They then have to quickly find a safe place to hide and prepare for the baby. Along the way, they encounter old enemies who now see Gamora's unborn child as a valuable asset.