Iron Fist (Danny Rand)
K'un-Lun is an other dimensional city that appears on Earth once every ten years. The primary defender of K'un-Lun is called the Iron Fist, a title given to any person who has successfully challenged the immortal dragon Shou-Lao for his power, or Chi.
The current Iron Fist is billionaire Daniel Rand. His father, Wendell, had known the previous Iron Fist, Orson Randall, and learned about K'un-Lun and the Iron Fist from him. While Wendell wasn't worthy to be Iron Fist, his son was destined to be one of the greatest Iron Fists. So while Daniel was just a child, Wendell took him and his wife into the Himalayas to find K'un-Lun and destiny. But Wendell and his wife both died along the way, leaving Daniel orphaned at the gates of K'un-Lun.
Raised by Lei-Kung the Thunderer, the now-orphaned Danny mastered the martial arts and earned the title of Iron Fist. As Iron Fist, Daniel is one of the finest martial artists in the world. In addition, he can harness the Chi of Shou-Lao for a variety of purposes, including accelerated healing, strength, speed and the ability to focus all of his energy into his fist, making it "like unto a thing of iron". That means he can hit things really really hard.