The important new character in Durarara Vol 5 Light Novel is Aoba Kuronuma. He's a complex addition to the cast. Aoba has an air of mystery around him. He quickly becomes enmeshed in the power struggles and the web of relationships in Ikebukuro. He seems to have his own agenda, which isn't fully clear at first. As the story progresses, we see how his actions and his personality start to shape the events. He also has an impact on the way the other characters view their own situations and the state of the city as a whole. His presence really shakes things up in the already chaotic world of Durarara.
There might be a new mentor - like figure who has a unique perspective on magic. Maybe there's also a new rival, someone who challenges the main character in his pursuit of knowledge or power. These new characters would add more depth and variety to the story.
Ainz Ooal Gown remains the most important character. His decisions and actions drive the plot forward. He is constantly strategizing about how to expand his influence in the new world.
I'm not entirely sure about brand - new characters specifically in Vol 8, but existing important characters like Ainz Ooal Gown continue to be central. His actions and decisions drive the plot forward.
I'm not entirely sure without reading it, but it's possible that no new major characters are introduced and the focus remains on Kazuma, Aqua, Megumin and Darkness.
One important character introduced could be some of the new leaders of the local factions in the New World. They play a role in the political and military aspects that Ainz and his forces interact with. For example, there might be a new king or a powerful general.
There is also a young trainee who looks up to the main character. This trainee has potential but is also naive in some ways. His interactions with the main character and other experienced characters provide some lighter moments in the story as well as show the growth of the next generation in this world.
One important character introduced could be new allies that Rimuru meets. They might have special abilities or knowledge that help Rimuru in his adventures. For example, there could be a powerful mage or a skilled warrior.
Mikado Ryugamine is one of the main characters. He is a young boy who moves to Ikebukuro.
In Durarara Vol 11, we will surely see Mikado, who has been evolving from an innocent transfer student to someone more involved in the darker aspects of Ikebukuro. Masaomi, his friend with a complex past related to the gangs in the city. Anri, who has her own secrets. Celty, the headless rider, is always a mainstay, with her search for her head and her connection to the various events and characters. Shinra, as her partner, also plays a crucial role. There may also be other important side characters like Izaya Orihara who often stirs up trouble.
Mikado Ryugamine is one of the main characters. He is involved in various events in Ikebukuro. Another important character is Celty Sturluson, the headless rider. She has her own storylines that are intertwined with others.