Azazel

Azazel is the leader of the fallen angels and has 12 jet black wings. He is very laid back and relaxed. He also likes to play a lot of jokes (Such as hiring issei to do simple stuff like playing video games with him for a reward like gold bars or jewels). He met up with the leaders of the Devils and Angels in novel 4 to form a truce. He has lost his left hand due to Katreya when they fought as Katreya made indestructable tentacles that wrapped Azazel's left hand claiming that they will explode but Azazel nonchalantly cuts off his own left hand. He replaces his lost hand with a prosthetic arm he develoved using his Sacred Gear research. Majority of the Fallen-Angels dislike Azazel for his laid back attitide which became worse after he made a truce with the Angels and Devils with an exception of only a few of his close friends, such as Shemhaza and Barakiel.

He is a Sacred Gear fanatic and collect thems in large numbers to study them. He even has a self-made artificial Sacred Gear that has the spirit of one of the dragon kings, Fahnir. His artificial Sacred Gear, "Down Fall Dragon Spear", takes a form of a jewel as its core because of its fragile exterior and forcefully activates it's Balance Breaker, "Down Fall Dragon Another Armor", which gives Azazel a Golden Dragon Armor which he made based on Vali's Balance Breaker.

According to Azazel, the reason why he became a Fallen-Angel is because of his interest in Women's Breast.

A genius inventor, Azazel has created many things from his Sacred Gear Research, a prosthetic hand with missile and lazer, the Jewel of Fafnir and a Sacred Gear Scanner which identifies every Sacred Gear.