Workshop

Regarding the quenta...
If the character is well-known and exists (in reality or elsewhere), why write a story about them? In most cases, it will turn out badly, so it's better to take existing descriptions of their appearance and other necessary information. After all, it's not an expedition, and it may not fit the atmosphere, or it may not be necessary. Even Leonardo da Vinci could become a member of a space crew, right?

A quenta is a short story describing the character's personality. It contains a brief history of the character, as well as descriptions of the events that preceded their appearance in the game world.

There may not be descriptions of the character in available sources (on the internet). Would you watch a multi-episode anime just to learn about a character's personality? I doubt it.
Or, on the contrary, there may be a great many descriptions, and they may differ significantly.
I'm not saying that you have to write the entire quenta yourself. Nothing prevents you from taking pieces of descriptions from different sources and adding a few words to describe the character's appearance in the game world.

And don't worry, the atmosphere is such that it perfectly accepts the existence of Luke Skywalker, Cthulhu, the brave soldier Schweik, and Gandalf the Grey in the same game.

the rules are good, but modkill should not be completely canceled.

The game is experimental in order to test new rules in action. I'm not completely canceling it – there will be a modkill for violations. For example, if I find out that you are talking about the mafia in instant messengers again, maybe even with "corpses."

Is a specific character required? Can't I create my own?

It's not required, but it's recommended. In the example game with quentas, for example, Kosha chose her Drakkosha as the character, and the character was accepted because it was a well-developed and interesting character.

No, most likely, the clues will be given not based on the text you wrote, but on general facts about the character. Otherwise, why should he be well-known? In this case, it is unclear why it is necessary to write the text.

That is, clues will be given based on the profile and this quenta?

Clues are given either based on the profile or the quenta; read the rules in their entirety and more carefully.

A farewell post is really not needed.

Regarding the roles, nothing prevents the mafia from pretending to be other roles – false reveals are also allowed. Or they can eliminate the most dangerous roles...
Regarding the display of night actions, I thought that I don't have many night actions displayed based on roles initially.