They could be classmates. For example, if the OC is in Gryffindor, they can study with Harry, Ron, and Hermione, participate in Quidditch practice together, and get into adventures in the Forbidden Forest. Or they could be rivals, like an OC from Slytherin who always tries to outdo Harry in every magical test or duel.
Well, an OC could be a new teacher's assistant at Hogwarts. In this role, they would interact with the main characters in a more mentoring - like way. They could offer advice on difficult spells or help them with their homework. Another way is if the OC is a healer in training at St. Mungo's and the main characters end up there due to some magical mishap. The OC would then take care of them and get to know them during their stay. Also, the OC could be a journalist for the Daily Prophet, interviewing the main characters about their latest heroic deeds or controversial actions.
Chapter 198, "Jiang·Deceitful·Li is Verified", 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 He wrapped his arms around himself and stepped back half a step,...
Chapter 401, ""Youth Trainee" Premieres!", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. It opens with With Huo Xuan's help, Jiang Li quickly got rid of the fans and was...
Chapter 306, "I Believe Whatever Miss Jiang Says!", is the clearest early answer because it turns Zhou's situation into a concrete plot event. Early on, But Jiang Li seriously shook her head, "No, Aunt Zhou, this matter....
Chapter 178, "The Group's Favorite Belongs to No One but Her!", is the clearest early answer because it turns Shang Shaojing's situation into a concrete plot event. The chapter gives readers a real answer by opening on Wen Jiaojiao is just too unreasonable, why does she have to single...
Chapter 505, ""Postpartum Care for Sows", is the clearest early answer because it turns Gu Yu's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Zhao Lang laughed, but his eyes became considerably clearer, "Is...
Chapter 308, "Want me to surrender to him? Don't even think about it!", is the clearest early answer because it turns Aunt Ying's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Jiang Li sighed, "Where is your mind wandering?
Chapter 436, "Do You Remember Brother Daniu by Daming Lake?", 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 Yu Li took the object that resembled a stone axe and weighed it in...
Chapter 399, "Wait Until I Am Rich", is the clearest early answer because it turns Jiang Mingchuan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Seeing Jiang Zhao Yuan's astonished expression, Jiang Li smiled and...
Chapter 344, "Actually has one million fans?!", 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 Just as he was about to slip into sweet slumber and catch up on some...
Chapter 411, "You Really Hold a Strong Grudge", is the clearest early answer because it turns Yu Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from The lead director, who understood the entire process, had an...