In a novel named 'Heart of Iron', the main characters might be individuals who are in the middle of a great conflict. Maybe there is a brave soldier with a heart of iron, unafraid of the horrors of war. There could also be a cunning politician who uses his or her strong will to manipulate the situation. And perhaps a civilian who, despite the hardships, shows an inner strength symbolized by the 'heart of iron' and becomes an important part of the story.
The boy is one of the main characters. He befriends the Iron Giant and helps him in many ways.
There could be a young adventurer as one of the main characters. This character might be drawn to the mystery of the iron dragon and set out on a journey to find out more about it. Another character could be an old sage who knows some secrets about the iron dragon and guides the other characters. Or perhaps there's a villain who wants to use the iron dragon for evil purposes.
I don't know the exact main characters in the 'Iron Gods' novel as I haven't read it. But usually, in such novels, there could be a brave hero or heroine who is on a journey to discover the truth about the iron gods.
There could be a group of adventurers as the main characters. They might come from different backgrounds, like a wizard, a warrior, and a thief. And they all have different reasons for being involved with the iron dragons.
Since we don't have more details about this 'black iron novel', it's impossible to determine the main characters. It could be a hero who discovers the secrets of black iron or a group of adventurers who are on a quest related to black iron.
I'm not sure specifically without reading the 'the heart novel'. But usually, there's a protagonist who drives the story forward. There might also be a love interest, a mentor figure, and an antagonist who creates conflict.
I'm not sure exactly as I haven't read it. But usually in such novels, there could be a protagonist who drives the story forward. Maybe it's a young person on a journey of some kind.
Iron Man is the main character of course. And there are some villains like Ivan Vanko who causes trouble for Iron Man.
I'm not entirely sure, but it might have a young hero as one of the main characters who gets involved in the events of the fey world.
The main character is Tony Stark. He is the one who becomes Iron Man.