Percy Jackson : The Odyssey of a Primordial. - Chapter 12: Hades

After 2000 years has passed, the ruthless demon lord has just been reincarnated! But his aptitude at an academy for nurturing candidates for demon lords is, “Inept”!?

Having the capability to destroy humans, elementals, and gods, after a long period of countless wars and strife, Arnos the demon lord became sick and tired of all that and longed for a peaceful world, so he decided to reincarnate to the future.

However, what awaited him after his reincarnation is a world too used to peace that his descendants became too weak due to a huge weakening in magical powers.

Arnos enrolled in the Maou Academy established to find any students that might be the demon lord’s reincarnation, but his powers are too extraordinary that those in the academy couldn’t properly judge his powers, so he’s regarded as an “Inept student”. Being underestimated and avoided by most people there, he recruited a girl friendly to him, Misha, as his subordinate and comrade, and strives to climb to the top of the demon race hierarchy to one day reclaim his former title and status.

When encountering demons, a young man with two horns on his head, red hair reaching his waist, and an extremely handsome appearance leads the demons to the front.

Youdou: Actually, I really don’t want to be a master of monsters. This profession is completely useless. My ideal is to become a magic stick…, bah, it’s to become a great onmyoji.

All the monsters: My lord, wake up, you are the leader of the monsters yourself!

- Description from novelbuddy

Yi Zaha. The crazy demon crazy for martial arts. While he was running away after stealing the heavenly pearl of the Demon Cult Leader, he fell off a cliff. After thinking that everything was over, he opened his eyes to see that he had returned back to when he was a waiter… And he is being beat up for something that he didn’t do. The crazy demon who returned to the beginning of his days as a waiter! Will he go crazy again, or will he drive his enemies crazy?

Giles transmigrated to a world where everyone practiced beast-taming, and he was adopted by the owner of a beast-taming arena from a young. However, Giles could only run errands and do basic chores since he didn’t have any talent for beast-taming.

One day, the arena owner had to go on a long trip, so he entrusted Giles with the management of the arena.

Faced with a bunch of baby beasts waiting to be fed, the inexperienced Giles could only tell them about the stories that he’d heard from his past life. [Pet Beast Guru Duck finished listening to “The Ugly Duckling”, evolved into an “Eight-winged Swan Beast”!] [Pet Beast Beetle Bug finished listening to “Godzilla”, evolved to learn “Ultra Heat Beam”!] [Pet Beast Lil Ape finished listening to “King Kong”, evolved into an “Invincible King Kong Beast”!] [Pet Beast Green Haired Dog finished listening to “Greek Mythology”, evolved into a “Cerberus”!] Even that rock pet beast in the corner.

After listening to Giles telling the story of “Journey to the West”, the rock split open and evolved into the Ancient God-tier pet beast, “Heavenly Sage Sun Wukong”!

When the arena owner returned, he was stunned, I told you to take care of the arena, and you trained them all to become Divine Beasts?!