Heinrich

Heinrich Hein, also known as the Angel Killer, was a legendary, unbaptized hero who defeated the vile, corrupt Monster Lord Alipheese Fateburn VIII (Eighth), also known as Black Alice, 500 years prior. He was able to master the Four Spirits and their elements, and is the creator of the Quadruple Giga and Element Spica techniques. He is also the ancestor of Marcellus and Luka and the original wielder of Angel Halo.

Heinrich's beliefs seem to indicate that he was, like his descendants, a pacifist and thought coexistence between monsters and humans was possible. Tamamo reveals that like Luka, he discovered that Goddess Ilias was the instigator that denied coexistence and fought against her and the armies of Heaven. However, he did not come to the Four Spirits for aid in this campaign (not wanting them caught in the crossfire), and despite his skill, met his demise.

Biography
Using the power of the Four Spirits, Heinrich ended Black Alice's life as a means of bringing peace to the world, and was then, according to popular belief, ascended to Heaven by Ilias. However, this was revealed to be a false rumor; what really happened was that sometime after his battle with Black Alice, Heinrich left the Four Spirits and revolted against Ilias, trying to fight against her and her angel army alone. He was able to defeat most of them, earning the nickname "Angel Killer", but eventually their holy energy and that of Angel Halo completely eroded his body and his soul was sealed into the sword. Ilias extracted and sealed his spirit in the Sealed Sinner’s Prison for all eternity; the ultimate punishment where one cannot reincarnate. It is also mentioned that Ilias saved Black Alice, though it is unclear whether she intervened with their battle.

Lilith & Lilim, whom were sealed 500 years prior, inexplicably refer to Luka as Heinrich’s descendant, claiming that he sealed them with the Angel Halo and that Luka’s looks, smell, and power resemble Heinrich’s. Granberia also claims that Luka’s power matches Heinrich’s which further proves the relationship. In Chapter 3, Micaela confirms this, clarifying that Luka’s father Marcellus was the carrier of his bloodline.

Lilith & Lilim despise Heinrich so much that they refuse to recall his name. They also inexplicably mention that Heinrich destroyed all of Black Alice’s love, though this is never explored.

As Luka nears the Sealed Sinner's Prison the first time, the Angel Halo suddenly shines with a bright light, seemingly reacting towards Heinrich’s spirit.

After Ilias declares war on humanity, Luka and Alice try to record data of how Ilias sealed Heinrich in an attempt to borrow its holy energy. During the process, Heinrich's soul appears, possibly due to the interference caused by Alice. While they are surrounded by Chamaeru, Granaeru, Runaeru, and several Veteran Angel Soldiers, the ghost single-handedly eliminates all the angels using his own soul and Luka's body along with Element Spica and Quadruple Giga, much to their shock. However, Heinrich's soul has worn out and begins to fade, but Heinrich deems his descendant as his successor and tells him not to be a failure like him before vanishing.