A medical? Student reincarnated . And now he's in the academy learning magic and has a whole sea of mana. He he'll bent on passing using easy methods but he Mc and has nothing easy.

Mainly medical, but he uses magic for medical purposes.

Regressed and now on his way to become stronger using magic (and his spirit dragon ) and rebuild his family

He went inside his game, and because his character is weak he relies on drugs and is stronger because he uses magic not how the usual magic in that world works.

Regressed, was a warrior now a Mage, and the story is headed towards the Ragnarok and he is getting stronger to intervene the war between God's (Asgard and olympus)

Shadow summon. I guess it's related?

I love the magic theory here.

Like the name suggests a drak Mage, a returnee from another world, he a lumi cult fanatic. Now earth on the verge of collapse with the otherworldly demonic energy and he has to save earth.

Was a 9th circle archamage and now regressed and he on his way to save the world by being a prophetic warrior from the invading demons, and correcting his past mistakes

He might be a noble but grew up to commoners after being abandoned and now he's in the academy getting stronger by learning, a genius

He a swordsman, a magician and a shadow user