A common theme is Ratchet's role as a healer. Many fanfictions focus on his medical skills and how he uses them to save his comrades. Another theme is his relationships, like his friendship with Optimus Prime or his mentorship of younger Autobots.
In a fanfiction, Ratchet and Optimus could be sent on a secret mission. They are alone, away from the rest of the Autobots. This gives them a chance to have more personal conversations. They might discuss their hopes for the future of Cybertron, their fears about the Decepticons, and their memories of the old days. The story could show how they support each other not just in battle, but also on an emotional level.
A fanfiction might involve Optimus getting injured in a battle. Ratchet then has to use all his skills to save him. During the recovery process, they have deep conversations about the war, their hopes for the future, and the sacrifices they've made. It could explore their different perspectives as leader and medic.
There could be a fanfiction where Optimus and Ratchet are stranded on an alien planet. They have to work together to survive, find resources, and figure out a way to contact the other Autobots. This would really highlight their survival skills and their ability to cooperate under extreme pressure.
One popular idea for a Transformers G1 Blaster fanfic could be a story where Blaster discovers a new form of communication signal from an unknown planet. He then embarks on a journey to decode it, facing various challenges along the way from both Autobots and Decepticons who are suspicious of his new mission.
Yaoi fanfiction often explores unique relationships. In a Transformers Ratchet and Bumblebee yaoi fanfic, it might depict their deep emotional connection. Maybe it shows how they support each other during battles and rely on one another in the Autobot base. Their relationship could be shown as one of mutual understanding and unspoken feelings.
Another idea is for a time - travel fanfiction. Ratchet and Optimus are sent back in time to an important moment in Cybertron's history. They have to be careful not to disrupt the timeline too much while also trying to change certain events to prevent the rise of the Decepticons. This would require them to work together closely, using Ratchet's knowledge of history and Optimus's leadership skills to navigate this dangerous new situation.
One common theme is protection. Since a sparkling is a young and vulnerable Transformer, Ratchet might be in a role of protecting it from various threats in the war - torn Transformer world. Another theme could be mentorship, where Ratchet imparts his knowledge and skills to the sparkling.
A fanfic about Blaster could also explore his role as a keeper of Autobot history. He discovers some long - forgotten secrets about the origins of the Transformers that could change everything. As he tries to share this information with the other Autobots, he faces opposition from those who fear the truth might divide the Autobot ranks.
There could be a fanfiction where a powerful female Decepticon discovers a long - lost power within herself. This new power makes her a target among both the Decepticons and the Autobots. She has to decide whether to use it for good or evil while also fending off those who want to control her for their own purposes.