Well, power exploration is a common theme. Since Elsa has ice powers, the OC might have some kind of power too, and they explore how their powers can work together or be complementary. Another theme is the breaking of barriers. Elsa was once isolated, and the OC helps her break out of that isolation. There's also the theme of cultural exchange in some fanfictions. If the OC is from a different place, they introduce new cultures and ideas to Elsa, which enriches the story.
One common theme is self - discovery. The OC often helps Elsa to further understand herself and her powers. Another theme is friendship. They start as strangers and develop a deep bond. For example, in many stories, the OC might be the first person to truly accept Elsa for who she is.
Chapter 777, "Backstage Buffs Stacked!", is the clearest early answer because it turns Jiang Shixu's situation into a concrete plot event. The chapter turns that into something concrete by moving from Jiang Shixu also knew about his trending on social media.
Chapter 1 is the strongest chapter-level answer because it starts from Jiang Li, I'm warning you, don't set your sights on Yinwan anymore, or... and follows through on Yet before she had the chance to teach her a lesson, the male lead arrived....
Chapter 919, "Two More Grandsons", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event.
Chapter 794, "Debut as a Group!", is the clearest early answer because it turns Shen Lan's situation into a concrete plot event. The chapter gives readers a real answer by opening on Everyone crowded around Shi Xu as he entered the living room.
The best chapter pointer here is Chapter 31, "Master, I've been having some bad luck lately!". It opens with Before Shen Lan had reached the backyard, she already heard the sounds of... and closes on After staying in the study and reading for another day, she finally....
Chapter 854, "These Brothers Are Quite Lacking in Love", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with If this bracelet gets bumped anywhere, she'll be heartbroken, right?
Chapter 11 is the strongest chapter-level answer because it starts from After a meeting, Shang Shaojing pinched the bridge of his nose, tired, and... and follows through on Miss Qin, please accompany us to the police station to explain this....
Look to Chapter 9 for the clearest answer. It begins with Exactly, the Qiao Family isn't that great either., keeps building through They've been yelling and shouting since morning, with no sense of decorum..., and lands on Qiao, unable to save face, slapped her daughter across the face, "Didn't.
Chapter 17 is the strongest chapter-level answer because it starts from Jiang Li glanced at Jiang Shixu, who was tense and anxious behind her, and... and follows through on I've been a mother for more than ten years but never tasted anything made....