Leohart Stitched Cap (Shinmai Maou Testament Burst 05)
Name Leohart
Kanji レオハート
Rōmaji Reohāto
Age Unknown
Gender Male Male
Hair Color Purple
Eye Color Blue
White (While Fighting)
Personal Status
Status Alive
Relative(s) Liala (Adopted Older Sister)
Professional Status
Race Demon
Occupation Demon Lord
First Appearance
Light Novel Volume V
Voice Actor Kazuyuki Okitsu (Japanese)
Kyle McCarley (English)
Image Gallery

Leohart/Leohalt (レオハート Reohāto) is the current Demon Lord who lives in the Demon World, he is also the younger adoptive brother of Liala.


Leohart is a tall young man with tanned skin, purple hair and blue eyes. When he fights his eyes become white and his sclera turn black. He is seen wearing bulky black armor with purple cape. He also has large purple wings. In battle he usually summons his large broadsword.

  • Leohart and Liala in bath (Testament of Sister New Devil Burst 06)
  • Leohart
  • Demon Lord Leohart Stitched Cap (Shinmai Maou no Testament BURST 01)
  • Leohart and his men (Testament of Sister New Devil Ep 3)
  • Leohart Stitched Cap (Shinmai Maou Testament Burst 05)


Leohart is a highly intelligent and powerful relatively young demon. Although he maintains a calm and collected demeanor from a young age he has been driven by a hatred of the Demon Council and love for his adoptive sister and the demon world as a whole. Leohart despises the constant warring between the various demon factions and dreams of one day creating a united and peaceful world for he and his loved ones to live in, towards that end, he greatly desires to kill the members of the Demon Council which he perceives to be at the heart of the corruption in the demon world.


When Leohart was young, his parents was killed in one of the many demon civil wars and he ended up in a orphanage. He was adopted into a prestigious demon family who had in the past produced many demon lords. Shortly thereafter, he met his adoptive elder sister Liala whom due to having a beautiful appearance that was very similar to the Gods that the demons were descended from and whom were their most hated enemy she was locked away and her existence covered up. Also, Leohart's new parents gave numerous Blood Transfusions to draw out his power and allow him to past any demon lord lineage tests.

Although Liala was the Daughter whose existence they had to hide for all their sake, and Leohart the son they had adopted as a replacement their parents loved them both very dearly, and he would fall in love with his sister. When Leohart first went to fight in the previous great demon war it was explained that it was planned by his parents for him to conceive a child with Liala and acquire a substitute wife who would pretend to be the child's mother and continue their line.

Unfortunately, his parents would die while he was away, and although he would not learn it until later, it was due to a assault by the Demon Council who learned of Liala's rare and beautiful appearance and sought to take her as a toy. After the death of the former Demon Lord Wilbert, he merged together the Radical and Conservative Demon Factions by manipulating their hatred towards the gods into current Demon lord Faction and made their lord by the Demon Council who had hoped to be able to manipulate him by using his sister.

Instead Leohart has quickly managed to amass a huge amount of influence and powerful direct subordinates such as the former Demon Lord Candidate Balflear or the young demon spy turned traitor from the Moderates Faction Lars who would become his closest confidants. After Wilbert's death he attempted to protect his only daughter Mio Naruse with the intention of one day acquiring the demonic power that she inherited from her father as part of a plot to wipe out the Demon Council whom he regards as parasites and afterwards peacefully unite the various warring demon factions and benevolently rule them. When her Adoptive parents were killed his entrusted her protection to Lars.


Volume III

Leohart was seen walking with one of his men talking about Zolgear's disappearance and that it was unclear if he was dead, as it was reported a few just a moments ago. He ordered an investigation and to report to him at once. Thinking back to Lars' reports, he suspected that Zolgear was plotting something in secret, but was surprised a man of his power had been defeated. As he walked in to the royal throne room, he saw eight men on the ground as Jin welcomed him back saying, "You're finally home, huh?" He got "tired of waiting" and was intrigued that the current Demon Lord was so young before explaining that he's there to 'Thank him back for looking after his kids'.

Volume IV

Leohart immediately recognized him, prompting Jin to remark that it's an honor that even the new Demon Lord recognizes his name and face. Jin would then go to say that he's here to pay him back for hurting his kids. The two Leohart and Jin would have a high-level battle, to which neither of them seemingly went all out. Although, Jin ended up retreating after seeing the immense power of Loki. Leohart had planned to use the battle to acquire even more influence by defeating the 'God of War Jin Toujo' but instead his influence had been weakened after Jin turned Loki's power back on him and escaped unscathed.

Volume VI

After Mio had been brought into Wildarts the capitol city of the Moderate Demon Faction the Council forces Leohart to send the newly excavated 'Heroic Spirits' to attack Wildarts led by Balflear and the Council's plant Nebula, as well as secretly sending Lars to monitor the situation. After the disastrous attack was foiled by Basara Toujou and his servants Leohart had Lars rescue Balflear.

Volume VII

Following the attack, in order to avoid full scale war, Leohart instead proposes a seven on seven duel with the Moderates faction for Mio's power. Having sent his messenger Leohart then goes to visit his sister. Leohart attempts to defend the Hell Hound named Bearu who Liala was giving a bath when she ran off in abject terror from her by pointing out that she can't neuter her since she's not a he. The two bath together before going to bed and having sex together.

Before the two goes to sleep, Leohart reaffirms his desire to unite the two largest demon factions under one ruler, and create a world where his sister can live freely and happily.

Abilities & Powers

As the Demon Lord, Leohart is incredibly powerful, and is able to hold his own against Jin and end it in a stalemate.

Master-Servant Contract: Following his defeat in volume 7, Leohart came to the realization that Basara's strength wasn't entirely his own. He realized Basara's strength was rooted in his bonds with the people closest to him. For that reason, Leohart decided to tie a master servant contract with Liala.

Leohart has the cursed sword, Loki, which Jin recognized as the most powerful magic sword. Jin called it the Devil Lord's sword.


Liala- She is his older sister.