Superpowered Programmer Becomes King in Another World

The story takes place in a fantastical, magical anime-style world made up of different kingdoms and races. The protagonist is David, an ordinary programmer from the real world. He accidentally transmigrates to this world, gains astonishing superpowers, and joins the villains. To add drama, you can introduce a powerful antagonist, perhaps the leader of a dark force threatening the anime-style world, who must be defeated.