Leo Demonheart

Leo Demonheart is the former hero who was denounced by the human world after saving them from the Demon Army because of his unparalleled power. In Tokyo 2060, he was created by humans to fight back the demons. He is the strongest of all of the Twelve Demonheart Series. He is the titular male protagonist of the Yuusha, Yamemasu series.

Appearance
Leo has the appearance of a young handsome man with short black hair and striking red eyes. He wears a greyish-white long shirt along with a short black tunic hoodie which is usually put off, a pair of light brown fingerless gloves, a brown belt along a brown suspender hanging on the left side around his waist, black pants, and a pair of black high boots.

During his hero days, he used to wear heavy armor with a long navy blue cloak.

Pre-Creation
Initially being created as a weapon by Humans to before against Demons coming into the Human world by a hole, Leo had no emotional feelings other than killing the demons and protecting humankind. He rather used to have composed, carries an expressionless face most of the time, and keeps a cool head in decision making and planning.

After meeting a certain demon, he changes drastically, and the demon becomes his first friend. The demon teaches him about human feelings and how he should stop living on other orders and should live for himself.

Post-Creation
As the sole survivor of the Twelve Demonheart series, he gradually changed, gaining a high ego for being a hero. Even after saving mankind, he sticks to the mission of saving humans and that made him go to the demon world. From generation to generation, Leo has been famously proclaimed as Hero making him "The Strongest Being".

Undoubtfully, Leo had come to the conclusion that he has the hunger of being a hero and likely because he gets excited about killing someone.

As the times passed, Leo finally defeated the demon lord, Echidna, but that ends as a betrayal. Leo got denounced by humans because of his monstrous power. Because of this Leo developed a deep grudge against humanity and filled with vengeance seeks to destroy the whole world that he once saved, a million times.

Background
Leo is born as one of the Twelve Demonheart Series to save humans from the attack of demons. First, he was frail and the weakest of the series. But he himself overpowers thousands of demons single-handedly and became the strongest being in the whole world.

Abilities

 * Crimson Comet: A High level attack magic
 * Twelve Layers Of Barrier (Statis)': A High level magic which can nullify or seal any type of magic regardlessly.
 * Voice Changer: A magic that allows to change your voice to anybody's.
 * Metamorphisis: A magic for disguise.
 * Clearance: A magic which can heals diseases or curses.

Rare Magic

 * Mirage Eye: A magic technique that can send the information that was seen as it is in its eyes to its caster.

Quotes

 * "Eat, sleep and play, I can laze around as I like here!"

Trivia

 * Leo inherits the power of Hero by Philosopher's Stone. Though it doesn't mean that anyone could get the power on touching the stone or whatever, Leo was able to hold the power due to his abundant life experience.
 * Leo is powered by the Akashic engine (Philosopher's Stone) which serves as his heart.