Mikasa could also be a main character. Her relationship with Eren is always a key part of the story, so in the short story, it might show how she protects Eren or their interactions in a unique setting. Also, Armin, with his intelligence and strategic thinking, may be present and be involved in some crucial decision - making in the short story.
There could be new characters introduced as well. These new characters might be from a different part of the world within the Attack on Titan universe. They could bring new perspectives and conflicts, for example, a group of people who have a different understanding of the Titans and their existence, and how they interact with the known characters like Eren, Mikasa, and Armin.
Eren might still be one of the main characters. Since he is such a central figure in the main series, it's likely he plays an important role in the short story as well, perhaps in a different situation or with a new aspect of his character explored.
The main characters include Eren Yeager. He is a very important character with his determination to fight the Titans. Mikasa Ackerman is also a main character, known for her great combat skills and her loyalty to Eren. Armin Arlert is another key character, being intelligent and often coming up with strategies against the Titans.
It could be the kittens themselves. Maybe there's a lead kitten that has special abilities or a unique backstory related to the Attack on Titan world. For example, it could be a kitten that was experimented on by the same people who created the titans.
Armin could also be a main character. His intelligence and strategic thinking would play a role if Sakura is involved in the fight. He might be the one to figure out how to best utilize Sakura's unique skills and abilities in the battles against the Titans, and they could form a friendship based on mutual respect for each other's capabilities.
Mikasa Ackerman is another important character. She is highly skilled in combat and is very protective of Eren. Her loyalty to Eren is a significant part of her character.
The Colossal Titan is one of the scariest. It's so huge and can cause massive destruction just by its appearance. It can break through walls with ease, leaving the humans defenseless.
Eren Yeager is extremely important. He is the main protagonist and his transformation into a Titan is a key part of the story. Mikasa Ackerman is also crucial. She is a very strong fighter and has a deep bond with Eren. Levi Ackerman is important too. He is known as humanity's strongest soldier and plays a vital role in battles against the Titans.
The old story can give characters a sense of purpose. For instance, if their ancestors had a role in the old story, they might feel compelled to continue that legacy.
There's Angel, who is a central character with his own story arc. He has to face many challenges in this pre - main - story world. Then there are his comrades like Kasugabe. They all have different personalities and motives that drive the story forward. For instance, some are more focused on revenge against the Titans, while others are trying to find a more peaceful coexistence.
Eren could definitely be a main character. He could use his Titan -shifting abilities in a unique way during the Halloween - themed events. Maybe he discovers a new power related to the spooky atmosphere. Mikasa would also be a great main character. She could be protecting Eren and the others from any unexpected threats that come with the Halloween setting.
Well, it's likely that Eren would still be one of the main characters. After all, he's a central figure in the original 'Attack on Titan' story. He might be the one most affected by seeing the future and could play a crucial role in trying to change it.