Well, interesting character relationships are key. When an OC forms relationships with the Autobots or Decepticons, it can lead to all sorts of new storylines. For instance, an OC becoming a mentor to a young Autobot or having a complex love - hate relationship with a Decepticon. Also, the plot. A good plot in a Transformers Animated OC fanfic could involve the OC solving a big mystery that the Autobots and Decepticons haven't been able to figure out, or the OC being the key to a new power source that both sides are after. And the setting. If the fanfic takes place in a new and unexplored part of the Transformers universe, it can be really captivating.
A lot of things can make it interesting. The development of the OC over the course of the story is important. If we see the OC grow from a naive newcomer to a powerful and respected figure in the Transformers world, it's engaging. Also, the fanfic can be interesting if it challenges the norms of the Transformers Animated universe. For example, an OC who doesn't believe in the traditional Autobot - Decepticon divide and tries to bridge the gap between the two factions. And of course, the writing style. If the author has a vivid and engaging writing style that really brings the characters and the world to life, it will make the fanfic interesting.
Chapter 643, "Jiang Li Dominates the Trending Searches!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from Qi Tianyu joyously carried his construction to the side to wait for...
Chapter 439, "Never Question Sister Li", is the clearest early answer because it turns Sister Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from There was no helping it, she brought the man here, so even if he was...
Chapter 424, "He Must Be Very Strong", is the clearest early answer because it turns Tong Xiaoqi's situation into a concrete plot event. Early on, Shh!" Jiang Yan, who was leading the group, turned around and made a.... By the end, Isn't this just exploiting a loophole?!.
Chapter 264, "The Truth", is the clearest early answer because the hidden truth stops feeling like mere subtext. A useful checkpoint is the way the scene starts with Jiang Li first reassured her mother, then opened the chat box with...
Chapter 441, "The Taoist also Chases Stars?", is the clearest early answer because it turns Fengshui Arrays's situation into a concrete plot event. The chapter gives readers a real answer by opening on She had also only learned a little trick after reading many books.
Chapter 149, "Director Zhang, I heard you've encountered some troubles lately", is the clearest early answer because it turns Zhang Cheng's situation into a concrete plot event.
Chapter 447, "Going Viral on the Internet", is the clearest early answer because it turns Going Viral's situation into a concrete plot event. The chapter turns that into something concrete by moving from Old Sir Jiang: "...." His face had grown even worse.
Chapter 206, "Miss Su, Thank You So Much!", is the clearest early answer because it turns Sister Yin Wan's situation into a concrete plot event.
Chapter 401, ""Youth Trainee" Premieres!", is the clearest early answer because it turns Xi Yang's situation into a concrete plot event. The chapter turns that into something concrete by moving from With Huo Xuan's help, Jiang Li quickly got rid of the fans and was...
Chapter 318, "I Shouldn't Have Given Birth to You in the First Place!", is the clearest early answer because it turns Have Given Birth's situation into a concrete plot event. It opens with Jiang Cheng glanced at the pink and white building from the bus.