It could be the shooter. Maybe the shooter has a change of heart after shooting the raven and tries to make amends. He could then become the central figure as he embarks on a journey to save the raven's life.
Well, it could be that the raven is a special or magical raven. Maybe it was flying over a restricted area and got shot by a hunter who didn't realize its importance. Then, the story could follow how the raven's friends or family try to save it or seek revenge on the shooter.
Often, there are other animals like the Eagle. The Eagle is usually portrayed as a noble and powerful character, sometimes in contrast to the Raven's more mischievous nature. There are also the Salmon, which are important as they represent a vital food source in the Northwest Indian culture. And the Bear can be another main character, often seen as strong and somewhat of a force to be reckoned with in the stories.
The shooter could be a main character. We could explore their motives, their background, and what led them to commit such a heinous act. For example, if the shooter was a disgruntled former soldier who felt Lincoln had wronged him in some way. Another character could be Lincoln's wife. We could see her reaction, her grief, and how she copes with the situation. Or perhaps a doctor who tries desperately to save Lincoln's life could be a main character, showing the medical challenges and the hope against all odds.
It could be Beast Boy. Their relationship in the original series has some chemistry, and in the fanfiction, it would be an interesting twist if he were the father. Maybe their relationship takes a new turn when Raven discovers she's pregnant.
Raven could be a new character created specifically for this fanfiction. She might be a powerful witch from a distant magical land, with unique magical abilities like the power to communicate with magical creatures on a deeper level.
Raven could be an ancient and powerful witch who has been living in seclusion for centuries. She might have noticed Harry's special aura or his connection to powerful magic and decided to adopt him to pass on her knowledge.
It could be a young orphan who has made the house their home. They have no family but the house gives them a sense of security. When the house gets shot, they are determined to protect it at all costs. They might seek help from the neighbors or use their wits to fend off the attackers.
In a fanfiction, it could be a shadowy organization. They might have heard rumors about Raven's unique powers and decided to take her. This organization could be researching ways to gain superhuman abilities and believe Raven holds the key. Or it could be a deranged fan of Raven's powers. He might be obsessed with her and think that by kidnapping her, he can have her all to himself. Additionally, a vengeful spirit from Raven's past could be the kidnapper, seeking revenge for something she did long ago.
Enemies from her past, such as old villains she's fought against, would be likely kidnappers. They might hold a grudge for her previous defeats and want to use her for revenge or some dark purpose.
There could be a mysterious stranger who shows up to save Raven. This stranger might have been drawn to her injury by some sort of magic or prophecy. They could have unique healing methods that no one else in the story has seen before.