Definitely Danny Rand, he's the protagonist. There's also Misty Knight. She has a robotic arm and is a detective. She teams up with Danny on several occasions. And we can't forget about the villains. Bakuto, for example, is a significant villain. He has his own plans and is a powerful foe for Danny and his friends.
The main plot often circles around Danny Rand's return to his family's company while also being the Iron Fist. He has to deal with corporate intrigue as well as super - powered threats. For example, he might be in a boardroom meeting one moment and then have to fight off ninjas from the Hand the next. His dual life makes for some really interesting plot developments.
Iron Fist belongs to Marvel. He has his own unique story and powers within the Marvel comic book world, and has also appeared in related media adaptations.
One of the best is 'The Immortal Iron Fist' by Ed Brubaker and Matt Fraction. It delved deep into the lore of Iron Fist, exploring his connection to K'un - Lun. The art was great and the story had a perfect blend of martial arts action and mysticism.
The number of Marvel comic heroes is constantly changing and growing. As of now, there are well over 8000 characters, but new ones are always being introduced.
Definitely 'The Immortal Iron Fist'. It's highly regarded for its rich world - building. It introduced new elements to the Iron Fist mythology like the different Immortal Weapons. The story was full of twists and turns that kept readers hooked.