Naehara Hajime

In a world where aptitude for magic is determined by a crest. At the age of seven, Alec, the sixth prince of the sacred Luxian Empire, was given a crest of \[Dark Magic], which is said to turn him into a demon as soon as he uses it. Scorned by those around him, Alec became a shut-in in the palace, and in the last days of his life, he used \[Dark Magic], which he had never used before, in the hope of getting a good glimpse of it. However, Alec's crest was actually a special one that allowed him to use \[Dark Magic] without having his body taken over by a demon! He died as he was - but when he woke up, he was back to his childhood! Reverting back to his seven-year-old self, Alec uses \[Dark Magic] to turn all kinds of demons into his dependents, and together with his strongest companions, he builds an ideal country...!

Joshua is an overworked, underpaid production mage for the prestigious Knights of Schwarz order. When the order’s corrupted commander dismisses Joshua from his toxic job, he embarks on a quest for a new purpose. Along the way, Joshua's path intertwines with Illya, the princess of a Demon tribe, whom he saves from hunters targeting “demi-humans.” As thanks, he’s welcomed to the Demon tribe village. Witnessing their torment by the Demon King's army and slave traders, Joshua resolves to employ his production magic to aid them. Get ready for a fantasy where the greatest production mage and his friends work together to craft a splendid nation! (Manga UP! Global)

Hiel was ridiculed for having a useless crest and was exiled to a remote island. When he grabbed an ice axe to reclaim the island, the true effect of his crest was revealed. With his production cheat he will reclaim this uninhabited island and start his life in paradise.

Emperor Ludis suffered an unjustified death because of his Emperor’s Mark, which allowed him to make servants out of monsters. But instead of dying for good, he reincarnated a thousand years into the future. His previous life gave him no freedom, so this time, he’ll take it all and travel the world as an adventurer! But although he pretends to be normal, he gathers servants again and becomes the strongest adventurer! Come see what adventures await Ludis in this monster-filled isekai fantasy! Source: MANGA UP! Global

Hiel was ridiculed for having a useless crest and was exiled to a remote island. When he grabbed an pickaxe to reclaim the island, the true effect of his crest was revealed. With his production cheat he will reclaim this uninhabited island and start his life in paradise.

Emperor Ludis, Unfortunately passed away due to "Emperor's mark" (which subjugates "Magic Beasts"). 1000 years later, Ludis reincarnates into a person who should have died. Ludis, chained by rules in his previous life, will become an adventurer and travel around the world to live freely. He may appear to be an ordinary adventurer but behind the facade he is the strongest magic beast tamer. Together with his companions, he begins his wild journey in another fantasy world full of magic beasts.Original Web Novel (JP)