Strong male lead part 2

Classless/jobless (seems like they can't agree on which to use) MC to trains like it's nothing and powerful as all hell

Impressive mental strength, and quite a high IQ. Not the common strong ML as he ain't strong physically nor does he posses any powers.. well besides his brain

Was kinda hoping he was going down a darker side, but his "harem" of companions keeps him to the "good" side

From weak to strong with a will to fight for injustice, and a burning need for revenge against his high school bullies.

Brawns for brains, but he tries hard to study

Returning from another planet, our mc thought a thousand years had gone by, but it was only ten years on earth. As he learns what has happened on earth he also has to retrain to get his previous strength back. It's good.