I'm not sure as I haven't read it, but it could be the young lions themselves.
I'm not sure exactly who the main characters are without having read the novel in detail. But typically, in a novel like this, there might be a protagonist who drives the story forward.
Since I don't know the specific 'war of the lions story', it could have lions as the main characters, like the brave leader lion, the cunning rival lion.
Agrias Oaks is an important character. She is a knight with a strong sense of justice. Another one is Delita Heiral, who has his own ambitions and is involved in the power struggles. There are also characters like Alma Beoulve, Ramza's sister, who also has a role to play in the overall story.
Since the title mentions 'lions', it could be a group of people who were very brave in Little Rock. It might be students who were at the forefront of a fight for something important, like better education or equal rights. Maybe it was also teachers or parents who supported them and were part of this group of 'lions' in the story. They all could be the main characters as they played significant roles in the events the story is based on.
It's a novel that likely focuses on the experiences of young lions. It could be about their growth, challenges in the wild, and their relationships within the pride.
The main character is Ramza, a young man who gets involved in the complex political and military affairs. Delita is also very important. He is Ramza's friend at first but their paths diverge as the story progresses. There are also characters like Agrias, a female knight who is strong and noble. These characters, along with many others like the corrupt nobles and the common folk caught in the middle of the war, all contribute to the rich tapestry of the 'FF Tactics: War of the Lions' story.
The main character is Harry Potter. The lions are also key characters. There might be an old wise lion, like a Dumbledore figure among the lions. And there could be a young and adventurous lion cub that becomes Harry's best friend while he is growing up. There might also be some wizard characters who later interact with Harry when he discovers the wizarding world.
One of the main characters was Colonel John Henry Patterson. He played a crucial role in trying to hunt down the man - eating lions.
Obviously, Harry Potter would be one of the main characters. Then, the King of Lions himself could be a central character. He could be a majestic and wise being with his own backstory and motives. Hermione and Ron could also be important characters. Hermione might be intrigued by the new form of magic in the lion realm and Ron could be there for support and comic relief, as he often is in the original series.
Most likely the big lions and the little lions are the main characters.