Horus, of course, is a key figure as his actions start the heresy. The Emperor is vital as the one Horus turns against. Then there are the Primarchs like Magnus the Red. His actions also have a big impact on the events. Leman Russ is another important character. His loyalty to the Emperor and his role in the events make him significant in the story.
In the Horus Heresy novel, Horus is the central character in a negative sense as his betrayal sets the story in motion. The Emperor is not only the leader but also a symbol of the Imperium. Rogal Dorn is important for his defense of Terra. He is a key figure in the fight against Horus's forces. Another significant character is Fulgrim. His fall to chaos also plays a major part in the overall narrative of the Horus Heresy.
Definitely 'Horus Rising'. It's like the cornerstone of the whole story, showing how things started to go wrong. Then there's 'Galaxy in Flames' which really amps up the action and the chaos. And 'The Unremembered Empire' is also important as it reveals some secrets that are crucial to understanding the Horus Heresy.
Horus is a main character. He was once a great and noble leader but was corrupted. Another is Leman Russ, the Primarch of the Space Wolves legion. He is known for his fierce loyalty and warrior spirit.
Konrad Curze is a central character in the Night Lords Horus Heresy novel. He is a complex and often terrifying figure. Other important characters include his lieutenants within the Night Lords legion. They carry out his orders and play important roles in the legion's operations during the Heresy. There may also be some characters from other legions or Imperial forces that interact with the Night Lords, and these interactions shape the story as well.
In these novels, Lion El'Jonson is a central figure. He is a powerful and enigmatic leader. Then there are his lieutenants who help carry out his commands and also face their own moral and strategic dilemmas. Another important character is Cypher, who is shrouded in mystery and his actions are closely tied to the fate of the Dark Angels. And Luther, who has a significant influence on the internal politics and the ultimate path of the legion.
There are many main characters. Horus, as I said, is a central figure. The Emperor, of course. Then there are the various primarchs. For example, Sanguinius, the angelic primarch of the Blood Angels. He has his own story arc of loyalty and the struggle against the heresy. Also, Fulgrim of the Emperor's Children. His fall to Chaos is quite a significant part of the narrative. And Guilliman, who later plays a huge role in trying to hold the Imperium together after the heresy.
The complex characters are one of the most interesting parts. For example, Horus himself, his fall from grace is a deeply explored arc. His motives and the internal struggles are fascinating.
The Horus Heresy books that typically advance the story significantly are those that focus on major battles and key character developments. For example, 'The First Heretic' and 'Galaxy in Flames' have major plot advancements.
The Horus Heresy series has a rich collection of novels. 'Nemesis' is an interesting one that focuses on a covert operation during the Heresy. 'Unremembered Empire' is important as it shows the actions of Guilliman and his attempts to hold things together. In addition, 'Vulkan Lives' is a novel that delves into the story of Vulkan, one of the Primarchs, during this tumultuous time.
In my opinion, they're great. They provide deep lore and engaging storylines that keep readers hooked. The detailed descriptions and strategic elements add a lot of depth.
Probably 'Horus Rising'. It's often considered a must - read as it starts the whole Horus Heresy saga. 'A Thousand Sons' is also very popular because it has a rich and detailed story about the Thousand Sons legion and their psykers. Another popular one is 'Galaxy in Flames' which is full of epic battles.