Well, in most Transformers storylines, the first prime is commonly regarded as Prima. His role and significance set the stage for the subsequent primes.
No, Transformers Prime is an animated series and doesn't have the ability to 'watch' fanfic. Fanfic is something created by fans for fans to read, and the Transformers Prime entity doesn't have the sentience or function to engage with such written works in the way a human or a sentient being capable of reading would.
Optimus Prime is always a popular character. His leadership and noble nature make him a central figure in many fanfictions. Fans often write about his heroic deeds and his internal struggles as a leader.
Optimus Prime and Bumblebee are surely main characters. They are important Autobots. Megatron from the Decepticons side is also likely to be a main character as he is the main antagonist.
A Soundwave love story fanfiction could be set in an alternate universe where Soundwave is an outcast among the Decepticons. He meets another outcast, and they form a bond. Their love story could be one of mutual understanding and growth. They might find a way to create their own little world away from the war between Autobots and Decepticons, building a new life together.
In the world of Transformers Prime, Bumblebee fell in love with Arcee. Bumblebee, with his bright optics, would always watch Arcee's every move. One day, while they were on a mission to protect a human settlement, Bumblebee saved Arcee from a surprise attack. After that, Arcee started to see Bumblebee in a new light. They would often go on drives together, just the two of them, sharing a silent understanding that was deeper than words.
The Decepticons would obviously be the main antagonists. Megatron would see Jack as a new threat and would try to eliminate him. Starscream might also be jealous of Jack's new status and try to undermine him in any way he can.
One plot idea could be Optimus Prime losing his memory and having to rediscover who he is while the Autobots try to protect him from the Decepticons. Another could be a story where Optimus Prime has to team up with an unlikely ally, like a human who has a special power that can help in the fight against the Decepticons. Or perhaps a plot where Optimus Prime travels to a different dimension and has to find his way back while facing new enemies.
One possible fanfiction could be about Dark Optimus Prime's origin. Maybe he was corrupted by a powerful dark energy source in the Transformers Prime universe. This could lead to him having different goals and motives compared to the regular Optimus Prime, like ruling Cybertron with an iron fist instead of leading it to peace.
Well, unrequited love in Transformers Prime fanfiction can be really sad and bittersweet. There could be a story where an Autobot has feelings for a different Autobot who doesn't feel the same way. This unrequited love can make the first Autobot question their self - worth and their place in the team. It can also make for some really intense and emotional scenes, especially when the unrequited lover has to watch the one they love get closer to someone else.
Once upon a time, Optimus Prime led the Autobots on a mission to a distant planet. The planet was filled with strange energy sources that could either be a great power boost or a deadly trap. Optimus, with his unwavering courage, decided to explore it first. As he ventured into the unknown, he faced many challenges and strange creatures. But he never wavered, for he knew the safety of his team and the future of their cause depended on his actions.