Isekai Quartet is basically a fun crossover where they put the shows OVERLORD, Re:Zero, Tanya the Evil, and Konosuba, all into a single fun chibi series that's really not canon besides a little bit of info like in this video. It is very nice seeing how the characters from each different show interact with each other and stuff, so if you haven't seen ReZero, Konosuba, and Tanya, you can't really watch isekai Quartet yet or else you will just be confused. If you have seen them though, it would be fun to see you react to it, its very good! In fact, OVERLORD has its very own chibi series that you should definitely check out! it is called Ple Ple Pleides and its about Nazarick's daily life, situations, problems, and fun stuff to watch. It has 4 seasons, but each episode is only around 1 -2 minutes long each. It is very cool and fun, as well as gives information on certain stuff. It would only take around like 4-5 videos to finish it all

To be honest Ainz can make such huge waves in this new world is due to his entire guild being isekaid along with him. If another player made it to the new world by just him/herself, they would need much more time and effort to make headlines. And it would be even more tough if they arrived somewhere outside the 3 power player countries (Slane, Re-Estize and Baharuth) since the other kingdoms are much more isolated and news rarely arrives from those parts or reach those areas unless its a major event like the Katze Plane massacre.

They put effort in Isekai quartet, so its worth watching, but It is good to know that the writers of that show are not Authors of the shows and a lot of the thing they do is just for fun. The only time There was some Author of overlord involvement was for this Player`s info.

Isekai quartet is pretty funny! I'm going you eventually shall l check out all the blu ray extras available on KZfaq, as they have some canonicity that is actually mentioned later on. I'm not sure, but I'm pretty sure that the overlord subreddit has them along with all the currently translated light novels in a Google drive file that is open to everyone