Once a gentle and kind man, after his wife fell into a coma he turned into an alcoholic, causing him to neglect his son and abuse his power as Deputy Commander. In Arc 5, he joined the Priscilla Camp in hopes that, if their camp wins the Royal Selection, he can gain access to the Dragon's Blood and save his wife.
Heinkel is a muscular man with short red hair, blue eyes and a stubble beard. He wears a black tabard with brown shoulder plates and chest armor, along with a dark cape, brown pants, gloves and black boots.
Heinkel is a slovenly, arrogant and brash man who is not ashamed to throw around his position to intimidate others for petty reasons. He is also willing to stoop low and resort to kidnapping if it will give him an advantage. Heinkel uses his son as a tool to safeguard his rank in the Royal Guard and has no problems making him act as a shield in times of danger at even the expense of others and Reinhard himself.
However, Heinkel was not always like this. In the past, when his mother Theresia van Astrea was slain by the Hakugei, he was the only person to stand by his son, while everyone else blamed the latter for the Sword Saint's death. He also deeply cared about his wife Louanna and became an alcoholic after she was inflicted with a condition that little is known about.
Heinkel was born to his father, Wilhelm van Astrea, and to his mother, Theresia van Astrea. In his younger days, he was a much more earnest and kind man who seemed to have aspirations of becoming the next Sword Saint like his mother and worked quite hard. He became the Deputy Commander of the Royal Guards, and sometime later he married Louanna. They had a son, Reinhard van Astrea. However, things would soon begin to go awry for the Astreas, first with Louanna suddenly falling into deep sleep two years after Reinhard's birth and left in an inanimate state without any cure for such condition. In grief, Heinkel began to abuse Galic Fabless, Louanna's doctor, due to the latter not being able to cure Louanna. Soon after Galic's death (due to a third party), Heinkel was overcome by guilt for directing his negativity towards Galic, and he became an alcoholic. From then on, Heinkel entirely ignored Reinhard's education and existence. Later, when the Hakugei came to the Kingdom of Lugnica, Heinkel was commissioned to lead a group of men to eliminate it, but he refused since he was too afraid. Theresia took his place at Heinkel's request but ended up being slain.
When Wilhelm returned from the search for a royal family member, he was as upset with Heinkel for his irresponsibility as he was with Reinhard for taking away the Sword Saint powers from Theresia during the battle, leading to a bad relationship between them. Heinkel continued working for the Royal Guards, with displeasure for both, and Wilhelm left them and started working for Crusch Karsten. Heinkel inherited the estate and territories of House Astrea after this. At some point, Heinkel had lost a duel to Reinhard at the age of 5 which afterword for a time. Later, unsavory rumors about the two's relationship began swell from that point in where suggest that Reinhard was being treated like a slave. However, Reinhard eventually joined the Royal Guard and earned accolades while Heinkel dishonored further languished and rotted in his hatred. A couple of months after the incident at the Sanctuary, he met Priscilla Barielle and formed an alliance of sorts with her in order to obtain the Dragon's Blood, so that he can cure his sleep-bound wife.
Swordsmanship: Despite being overshadowed by his more famous relatives, and his insecurity in his own abilities, Heinkel is still rather skilled with a sword. He was able to defend himself against Theresia's attacks, albeit for a short period of time, and easily dispatch assassins that outnumbered him, with Al even commenting his swordplay could be described as beautiful. To further exemplify his sword abilities, it should be noted that Heinkel easily slaughtered an entire camp of bandits.
Equipment: Heinkel is the current wielder of the Holy Sword Astrea (聖剣アストレア Seiken Asutorea), a sword given to him by his father Wilhelm van Astrea who wielded it in his youth, receiving it as a wedding gift from his father-in-law.
- Heinkel was named by Veltol Astrea, his grandfather.
- According to the author, if he was to write a story where Subaru wasn't the main character, he'd give the protagonistic role to Heinkel.
- Priscilla's Cheers for Me, Drunk Father Part.
- "Six corpses were lying there on the fluffy carpet inside Priscilla's room; and in front of these corpses, a red-haired man --- Heinkel --- was crossing swords with the last intruder." Priscilla's Cheers for Me, Shadows of Conspiracy Part: Section 3
- "The name of the holy sword that Wilhelm used when he was young, and that Heinkel now carries is also "Astrea"" Reinhard Birthday Q&A
- "It seems like he only came up with boys' names. I guess you could call it being dead set on that... That sort of stuff was rather like of your honoured Father" Sword Demon Battle Ballad: Curtains Close. Section 6.
- askFM Q&A