...hey, I've answered some of these in the game actually. :D

1. He would have gone to read it to stroke his own ego. It would have called him a 'fake Overlord' or implied he was less than awesome. It would have gone exactly the same. Seriously, that whole 'Raiden' thing, totally unnecessary.

2. Pterodemon hot wings.

3. A lot of like this. I mostly took it straight from Disgaea.

4. It wasn't on his movelist for the tutorial battle, so I actually think he didn't pick it up till he became a book. Then he just ran with it.