There's a character named Lyra Blackwood in some fanfictions. She's a Dark OC who was born into a family with a history of Dark Arts practice. But she has a conscience and struggles between following her family's traditions and doing what she believes is right. Another interesting one is Damian Nightshade. He's an OC who was experimented on by Dark wizards as a child, which gave him some strange and powerful Dark - related abilities. He then has to figure out how to live with these abilities and not be consumed by the Dark side.
One cool Dark OC is Selene Darkthorne. She's a transfer student from a foreign wizarding school where the study of Dark Arts was more accepted. At Hogwarts, she stands out because of her different approach to magic. She has a bit of a mysterious air about her and is often involved in plots that involve ancient Dark magic artifacts. There's also Adrian Shadowbrook. He's an OC who was cursed by a Dark wizard, which made him have an affinity for the Dark Arts against his will. He spends a lot of his time trying to break the curse and find his true self.
A rather fascinating Dark OC is Raven Mordred. He's an outcast in the wizarding world due to his appearance and his natural inclination towards the Dark Arts. However, he's not truly evil. He just has a different way of looking at magic. He often gets into trouble with the Hogwarts authorities because he experiments with Dark spells in his own way. And then there's Luna Nightingale. She's an OC who was influenced by a Dark spirit when she was young. As she grows up, she has to fight the dark influence within her while also trying to fit into the Hogwarts community.
Chapter 677, "Worshiping Sister While Avoiding Them", is the clearest early answer because it turns Jiang Zhao Yuan's situation into a concrete plot event. It opens with You should learn from your sister; she's made her own fortune and is...
Chapter 235, "Bungee Jumping in Ethiopia???", is the clearest early answer because it turns Valley's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Chasing Wind Youth was clearly becoming anxious, and as a result, his...
Chapter 716, "Cook a Special Meal", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event. Early on, The following week was much quieter, and Jiang Li finally had some.... By the end, Shao Changqing had also mentioned this issue before, saying that....
Chapter 441, "The Taoist also Chases Stars?", is the clearest early answer because it turns Fengshui Array's situation into a concrete plot event. It opens with She had also only learned a little trick after reading many books.
Chapter 720, "A Bastard Child Behaving So Arrogantly?", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. Early on, As finals approached, with a wave of his hand, Jiang Li sent Jiang....
Chapter 554, "I've calculated it, he won't die", is the clearest early answer because it turns Luo Xuan's situation into a concrete plot event. It opens with Just ahead, there should be a substantial source of water," Jiang Li...
Chapter 351, "Miss Jin Zhen Liu Suqing", is the clearest early answer because it turns Jiang Zhao Yuan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Jiang Yan: "....." How does someone manage to praise themselves with...
Chapter 443, "Did Jiang Li Steal Team F's Home?", is the clearest early answer because it turns Shang Shaojing's situation into a concrete plot event. It opens with Team D's captain, curious, turned around and was surprised to find...
Chapter 523, "Are the Researchers Sweating Profusely Now?", is the clearest early answer because it turns Are's situation into a concrete plot event.
Chapter 608, "Congratulations to Team Q for a Successful Escape!", is the clearest early answer because it turns Team's situation into a concrete plot event. The chapter gives readers a real answer by opening on Ji Yanbai narrowed his eyes, still marveling at the audacity of this...