Well, there's often an OC named Erenia. She's known for her exceptional combat skills and her ability to quickly adapt to new situations. Many fanfictions feature her as a key character in battles against the Titans.
One popular male OC is Kai. He's often depicted as a strong and fearless warrior who has his own unique fighting style. Another is Leo, who is usually portrayed as a brilliant strategist within the Survey Corps. And then there's Max, a male OC known for his ability to adapt quickly to new situations and his unwavering loyalty to his comrades.
Well, it really depends on different readers' preferences. However, OCs that are strong - willed and have unique abilities tend to be popular. For example, an OC who can communicate with the native creatures in the 'The 100' world might be really liked. They can use this ability to gain information or even form alliances, which makes them stand out.
There's an OC named Alex who is often popular. He has the power to control time on a small scale, which is a really cool ability in the Highschool DxD universe. Another is Sophia, who is a half - angel half - devil OC with the ability to nullify any demonic or angelic power. She is often written as a very complex character, trying to find her place in a world that doesn't fully accept her mixed heritage.
Another plot could revolve around an OC who is from a different time or dimension and has knowledge of advanced technology. They could use this knowledge to try and create new defenses against the Titans. Maybe they develop a weapon that doesn't require blades and 3D maneuver gear but is more effective in taking down Titans.
There's 'Luna', an OC often depicted as a half - moon spirit with the ability to manipulate moonlight. She's popular because she brings a touch of ethereal beauty and mystery to the Monster Prom setting. Her storylines usually involve her using her powers to create beautiful light shows during the prom or helping other characters with their personal problems under the moonlight.
Then there's Sophia. She's known for her charm and ability to form alliances easily. In the fanfictions, she can get people on her side and work towards victory in a very diplomatic way.
Some popular OCs include Ethan, a boy who is a bit of a troublemaker but has a heart of gold. He often gets into little scrapes in the factory but always manages to learn a valuable lesson. There's also Isabella, a girl who loves to dance and she discovers that some of Willy Wonka's candies can make her dance in the most extraordinary ways. And then there's Aiden, an OC who is a computer whiz in a modern - day take on the fanfiction. He tries to use his skills to help Willy Wonka with the factory's more technological aspects, even though it's a world full of magic and wonder.
Well, there's often an OC named Nova. She's usually depicted as having some sort of energy - based powers and being a friend or ally to Ben. Another popular one is Zephyr, who might be an alien - human hybrid with the ability to control the wind. These OCs are popular because they add new elements to the Ben 10 Omniverse.
A popular OC could be a warrior who has a lemon - shaped amulet. This amulet is said to give him special powers in battle. He is from a small house that has long been associated with lemons in the fanfiction. His story could involve him fighting in various battles, using his amulet's power to defeat his enemies. He might also get involved in the larger power struggles between the big houses of Westeros, all while his lemon - amulet remains a central part of his identity.
A skilled bounty hunter OC can also be popular. They have a dangerous and mysterious aura. In the context of a harem, they could encounter different female characters during their bounty - hunting missions, and these characters might be charmed by the OC's abilities and the sense of adventure around them.