Another factor is the exploration of themes. It could be about love, friendship, or redemption. If it's a love story, it should show how the OC and Gamora gradually fall for each other in a believable way. It should also stay true to the overall tone and lore of the Guardians of the Galaxy. For instance, respecting the different species and cultures within the universe. Plus, a touch of humor, like the kind we see in the actual Guardians of the Galaxy movies, can make the fanfiction even more enjoyable.
You can start by looking on fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. AO3 has a large and diverse collection of fanfics, and you can use the search function to specifically look for 'Guardians of the Galaxy OC x Gamora' fanfiction. FanFiction.net also has a lot of works in this category. Another option is to check out some Guardians of the Galaxy - related forums or communities where fans might share and recommend their favorite fanfictions about this pairing.
In certain 'Guardians of the Galaxy Peter Dad' fanfictions, Peter's dad might be from an alternate dimension. This could lead to a whole new set of adventures and challenges for Peter and the Guardians. It could involve different powers that his dad has and how Peter has to learn to deal with this new version of his father while still maintaining his relationships with the Guardians.
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 storyline could be Prince Peter leading the Guardians on a mission to a long - lost planet filled with ancient technology. This technology could be both a great power source and a danger if it falls into the wrong hands.