Heinrich

Heinrich Hein, also known as the Angel Killer was a legendary (unbaptized) hero who defeated the vile, corrupt Monster Lord named Black Alice, or Alice VIII (Eighth), 500 years ago. He was able to master the Four Spirits and their elements, and is the creator of the Quadruple Giga and Element Spica techniques.

Heinrich, being the former wielder of the Angel Halo, as well as his descendant’s, beliefs seem to indicate that Heinrich was a pacifist and thought coexistence between monsters and humans was possible. Tamamo reveals that like Luka, he discovered that 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, and despite his skill, met his ultimate demise.

Biography
Using the power of the Four Spirits, Heinrich ended Black Alice's life as a means of bringing peace to the world. According to a rumor, Ilias ascended him to heaven. However, the rumor is false: What really happened was that sometime after his battle with Black Alice, Heinrich left the Four Spirits and revolted against Ilias and fought against her and her angel army and was able to defeat most of them, earning the nickname "Angel Killer", but eventually their holy energy tore his body where Ilias then sealed his spirit in the Sealed Sinner’s Prison for all eternity; the ultimate punishment where one cannot reincarnate.

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

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.

In present day, after Ilias declares war and Luka and Alice try to record the data of how Ilias sealed Heinrich as an attempt to borrow its holy energy, Heinrich's soul appears, possibly due to the interference of the holy energy caused by Alice. While they are surrounded by Chamaeru, Granaeru, Runaeru, and several Veteran Angel Soldiers the ghost single-handedly eliminates all the angels while 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.