The first few chapters would be because they are for building a foundation, but more entertaining one's will be released as the story progresses.

The vampire created by me.

He will, later in the story.

Yes, but not right now.

Not right now, but it will be transferred to the new world at a later stage.

So, according to my information, there were bosses that were above level 100, this can be somewhat proven by the fact that some dungeons or bosses required more than 10 Players to fight. Also, world enemies were bosses in the end, requiring 30+ players to defeat.

There will be harem, but no seggs unfortunately. It will be insinuated, but I wouldn't write any explicit details.

Bem, então esta pode não ser a sua preferência.

Because of the story. With Nazarick there, the story wouldn't be as excited and I think many fanfics with Nazarick have already been written, so I wanted to do something a bit different. Who knows, maybe Nazarick will appear in the new world.