There could be. Fanfiction is a very diverse space, and for popular franchises like Ratchet & Clank, there are fans who create all kinds of pairings in their stories. To find yaoi fanfiction specifically for these characters, you may have to dig deep into the relevant fanfiction archives and use specific search terms. But keep in mind that not all platforms might support or host this type of content due to various reasons.
You can try some of the major fanfiction platforms like Archive of Our Own (AO3). It has a wide range of fan - created content, and you might be able to find Ratchet x Clank yaoi fanfiction there by using the search function. Just be aware that the content is user - generated and may vary in quality.
One interesting Ratchet x Clank fanfiction could be a story where they go on an adventure to a completely new and uncharted galaxy. In this story, they encounter strange new enemies and have to use their wits and unique weapons to survive.
One common theme is empowerment. Writers often depict the female Ratchet as a strong, capable character who can take on any challenge in the universe. She might be shown to be even more resourceful than her male counterpart in some stories.
Obviously Ratchet and Clank themselves are essential. But adding characters like Captain Qwark can add some humor. He could be the bumbling hero who sometimes gets in the way but also has his moments of usefulness. Another good character to include could be Dr. Nefarious. His evil plans can create great conflict for Ratchet and Clank to overcome.
You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own. Just type 'Ratchet x Clank' in the search bar, and you'll get a bunch of results. Then, you can read the summaries and reviews to find the ones that seem interesting.
One popular 'Ratchet x Clank fanfic' is 'The Galactic Adventures of Ratchet and Clank'. It expands on their friendship and the various planets they visit. Another is 'Ratchet's New Quest' which focuses on Ratchet going on a solo adventure and how it impacts his relationship with Clank. There's also 'Clank's Secret Mission' where Clank has to undertake a dangerous task on his own and Ratchet has to come to his rescue.
Another option is to join Ratchet and Clank fan forums or groups. People there often share and discuss their favorite fanfictions. They might be able to point you directly to some great stories with a female Ratchet. For example, Reddit has some active Ratchet and Clank communities where fans exchange such information.
One idea could be a story where Ratchet and Clank get separated in a dangerous new galaxy. Ratchet has to rely on his Lombax instincts and skills to find Clank while facing various new enemies. Another could be a pre - story about how they first met and formed their bond. Maybe Ratchet was in a tough situation and Clank's unique abilities saved him, starting their great adventure together.