You can try fanfic websites like Archive of Our Own (AO3). There are a lot of great works there. Just search for 'Baratheon' in the search bar and then filter through the results to find the ones with great original characters (OCs).
Another place could be FanFiction.net. It has a vast collection of fanfictions. Look for the Game of Thrones or A Song of Ice and Fire section as the Baratheon family is from that universe. Browse through the stories and read the summaries to spot the ones with good OCs.
Chapter 650, "Trouble on the Island?", is the clearest early answer because it turns Sister Bai Lu's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Pei Ye instinctively shielded everyone behind him.
Chapter 748, "Blacklisted", is the clearest early answer because it turns Blacklisted Jiang Li's situation into a concrete plot event.
Chapter 866, "Why don't you die in his place?!", is the clearest early answer because it turns San Francisco's situation into a concrete plot event. Early on, In Shuiyun Temple, Changqing silently watched everything happening in....
Chapter 513, "A Public Stage", is the clearest early answer because it turns Jiang Shixu's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Everyone was sharing their experiences in a few words, the banter...
Chapter 546, "Good Sister, Stop Hitting Me, I Was Wrong!", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. Early on, Jiang Li squinted her eyes, her expression colder than ever.. By the end, So what if I skipped classes?.
Chapter 432, "Return to the Homeland!", is the clearest early answer because it pushes South Africa into a new phase or setting. Early on, Jiang Li had also received the updated rankings.. By the end, He looked at the owner with a hint of surprise..
Chapter 449, "Do You Two Have to Be So Abnormal?!", 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 Ahhh, the young master's good looks have finally returned!" "Wuwuwu,...
Chapter 440, "You Know Fengshui Array?!", is the clearest early answer because it turns Team's situation into a concrete plot event. It opens with The scorching afternoon sun, wrapped with moist sea breeze, ascended... and closes on They wanted to eat meat too!.
Chapter 679, "Got Money to Buy Coffee but No Money to Pay Me Back, Huh?!", is the clearest early answer because it turns Got Money's situation into a concrete plot event. It opens with Cut, that's a wrap!" With Shao Changqing's shout, the lights across...
Chapter 572, "Only Second in the Country", is the clearest early answer because it turns Correct's situation into a concrete plot event. Early on, Little brother, this is a competition, and I won't go easy on you.... By the end, As the fifth question appeared, his confusion deepened..