NeoBee

Lee can handle chakra, he just can't mold them into a ninjutsu

Overlord is quite similar to One Punch-Man, both are series heavily focused on anything except the main character, the main characters were already established as the all powerfull, there's nothing more you can do about it, so they decide to focus more on other things, such as side characters, world background, the story, etc..

Even if you told them you know the future, it would only made them think that your are indeed worthy of the supreme being, a lot of "Sasuga..." would be thrown by them 😂

Real question? what makes you tired of him? because I too read the LN and most of the plot come from the side characters's POV

Dragons in Yggdrasil could transform into Human such as Sebas, but they will be 20-30% weaker than their Dragon Form.

The last 2 were probably killed by Eight Greed Kings