Broken Base: Danny's race has been a hot-topic for some time, particularly in the idea of adapting the comics into a show, as Marvel did in 2016. Some think it doesn't matter in the slightest, while others are upset that he plays the Mighty Whitey trope straight, and a third group thinks choosing an Asian actor would then play to All Asians Know Martial Arts. Finn Jones (Loras Tyrell from Game of Thrones) being confirmed to have been cast as Danny only fueled the debate even more, as there had been a campaign beforehand for Marvel to cast an Asian or half-Asian actor.
Contested Sequel: Lets just say that fans of Immortal Iron Fist and fans of Iron Fist: the Living Weapon don't like each other and leave it at it.
Nightmare Fuel: Bride of Nine Spiders' chest contains a cloud of killer arachnids.
Older Than They Think: Iron Fist was actually the second Marvel hero created to capitalize on the martial arts craze of the '70s. The first one, Shang-Chi, was authentically Asian and, ironically, his book Master of Kung Fu was much more popular (as he was basically an Expy of Bruce Lee starring in a licensed continuation of Sax Rohmer's Fu Manchu stories). Iron Fist struggled with cancellation until it was decided to pair Danny Rand with Luke Cage, at which point the two '70s fad characters exploded in popularity while Shang-Chi faded into relative obscurity.
Vivatma Visajit, the Hindu version of Iron Fist from issue 16 who can channel the Brahman.
The various previous and one future Iron Fists, some of whom received their own specials.
Tear Jerker: How Fat Cobra became an Immortal Weapon: Over his unnaturally long life, he sired thousands of bastard children; each with great talent and skill for combat, and each wanting blood for their abandonment. Fat Cobra spent years defending himself from sudden attacks, killing them all, until there were none left to fight.
In Iron Fist: the Living Weapon, Danny's background of working his way to becoming the Iron Fist is retconned into that Yu-Ti essentially chose Danny to be the Iron Fist from the start, raising more implications.
The 2017 Immortal Iron Fists series attempts to avert this by having Danny train a successor who's actually from K'un L'un.
Also note that in Iron Fist’s original origin story, his father was the brother of Yu-Ti, the leader of K’un-Lun. This would imply Danny is half-Asian, or at least otherwise held some kind of legitimate claim to the role. However, this seems to have been forgotten as soon as it was said.