Hermione might be the one. With her extensive research skills and vast knowledge of magic, she could have stumbled upon a way to remove the scar. She was always determined to help Harry, and this would be just another of her great contributions.
In the fanfiction, perhaps Harry would finally be free from the constant reminder of his encounter with Voldemort. His life might become more normal, without the stares and whispers related to the scar. He could focus more on his own growth and development as a wizard, rather than being defined by his past trauma.
One idea could be an OC named Ruby - Quartz. She is half Ruby and half Quartz. Her story could start with her feeling out of place among the full - gem characters. She has the fiery passion of a Ruby but the calm stability of a Quartz. As she tries to find her identity, she meets Steven and the Crystal Gems. They help her understand that being a half - gem doesn't make her any less special. She then uses her unique combination of powers to help save the day during a battle against a new Homeworld threat.
There's a fanfic called 'Male Gem's Adventure'. In this story, the male gem character starts off as an outcast but then discovers his true potential. It has some great action scenes and also delves into the relationships between the male gem and the other well - known characters from Steven Universe. It gives a fresh perspective on the gem universe.
One common theme is self - discovery. Gem OCs often have to figure out who they are in the context of the Steven Universe world. For example, they might be different from the known gem types and have to learn about their own powers and purpose.
I'm not entirely sure as it might be a fan - made or niche project. It could potentially be a visual novel that involves the Gem characters from Steven Universe in some sort of blast - related adventure or story. Maybe it has elements of combat and exploration within the rich universe of Steven Universe.
Maybe it's an old foe who has come back with a vengeance. For example, a gem that Steven thought he had defeated before might return and capture him in order to get revenge. This foe could have some new abilities or powers that make it difficult for Steven to escape.
A really interesting crossover is when the Gem technology and Naruto's jutsu are combined. For instance, the Gems' ability to teleport could be compared to some space - time ninjutsu. It's fascinating to see how the two different power systems interact.
The freedom to tell different stories. In the official show, there are certain storylines and character arcs. But with OC gem fanfiction, you can take things in a completely new direction. You can create a gem from a different colony, with a different purpose, and see how they interact with the familiar characters like Steven, Garnet, Pearl, and Amethyst. It adds a whole new layer of depth to the Steven Universe experience.
The Diamonds are extremely popular in gem war fanfiction. Their power and their role in starting and perpetuating the war are fascinating to explore. Writers can delve into their motives, their relationships with each other, and how they react to the events of the war, whether it's through changing their views or doubling down on their actions.