The OC can stand out by having a distinct personality. For example, if most of the harem members are more on the outgoing and aggressive side, the OC could be calm and collected. Their different approach to situations would make them noticeable. Also, having a unique power or ability that no one else in the harem has would definitely set them apart.
One way for the OC to stand out is through their backstory. If they have a tragic or mysterious past that is slowly revealed, it will pique the interest of Rias and the other harem members. They could also have a different cultural or ethnic background compared to the rest, which would bring in new traditions and ways of thinking. For instance, if the OC is from a long - forgotten clan with ancient magic techniques, it would be very interesting. Additionally, their sense of humor could be different, making them the one who always brings a fresh perspective during interactions within the harem.
The OC could stand out by being an expert in an area that the harem lacks knowledge in. Say, the OC is a master of ancient languages and can decipher old texts that hold valuable information for the harem's activities. Or they could be an exceptional strategist, able to come up with battle plans that are far more effective than what the harem usually devises. Their physical appearance could also be distinct, not in a clichéd way but in a way that reflects their unique character. For example, they might have a unique hair color or style that is associated with their special abilities or their origin story.
Chapter 156, "Mirror Immortal, 10 Days to Gather Beast Blood", is the clearest early answer because it turns Yuwen Hu's situation into a concrete plot event. The setup is Do you think the leader's decision was meant to exclude us?" "What..., but the pressure keeps building through He too lowered his head in thought, and soon, his expression subtly....
Chapter 168, "Snow Bamboo, Longyou, Sudden Wealth - Part 3", is the clearest early answer because it turns Arrow Bamboo Forest's situation into a concrete plot event. It opens with Xia Hong encompassed the entire Arrow Bamboo Forest on the scroll,... and closes on So far, Great Xia has ventured only about three to four kilometers.... The key payoff is that the chapter closes with Xia Hong paid it no mind at all;
Chapter 162, "Once and For All, Victory", is the clearest early answer because it turns Great Xia Camp's situation into a concrete plot event. The setup is The remaining forty-plus Earth-digging Realm individuals continued to..., but the pressure keeps building through On the other side, Gao Yu had long since been forced to the south....
Chapter 170, "Camp Integration, Territory Rapid Expansion (Part 2)", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. It opens with As expected of a giant camp, the number of people in the Logging... and closes on The top leaders, He Yuanhun and Yuwen Hu, only needed to oversee the....
Chapter 170, "Camp Integration, Territory Rapid Expansion (Part 2)", is the clearest early answer because it turns Great Xia's situation into a concrete plot event. The chapter gives readers a real answer by opening on As expected of a giant camp, the number of people in the Logging... and ending on The top leaders, He Yuanhun and Yuwen Hu, only needed to oversee the....
Chapter 172, "The Competitions Ends, Surprises Galore", is the clearest early answer because it turns Hong Yu's situation into a concrete plot event. The chapter turns that into something concrete by moving from Who the hell is dragging me... to Isn't it amazing?" Now Yuwen Dao's eyes were not just curious but....
Chapter 162, "Once and For All, Victory", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. The setup is At this moment, Shi Ping extinguished the fire of the Iron Refining..., but the pressure keeps building through Only the four Intermediate Cold Beasts remained unmoved..
Chapter 259, "Tasks, Helplessness, Ongoing Screening (Part 2)", is the clearest early answer because it turns Xiang Liang's situation into a concrete plot event. The chapter gives readers a real answer by opening on Like him, there are twenty-eight other people who took on this task. and ending on Soon, a majestic and solemn massive main building appeared in....
Chapter 255, "Frenzied Fortune-Making, Dangerous Thoughts, Perfect Timing", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. The chapter gives readers a real answer by opening on 60 drops of Cold Apple Jade Dew, 180 stalks of White Frost Grass, 180... and ending on Just this volume, the weight of a piece of silverware must far exceed....
Chapter 158, "Preparation, Arrival", is the clearest early answer because it turns Iron Ore's situation into a concrete plot event. A useful checkpoint is the way the scene starts with First Year of the Great Xia, March 16th, around midnight The mine on... and follows through with It seems to be for reinforcing the wooden houses, Mu Dong and a few....