Heroes 3 (HEROECOPALKA)

Well, for example, Verdish is a Sorceress, right? And who is Voi?

Verdish and Voi have the same class: "Sorceress," and they will never appear together in the tavern. Iron, you have my reference guide – all the classes are listed on the first page... :)

Added after 1 minute

Could it be that at the beginning of the week, there are two heroes from the SAME Castle, but of different classes???

Yes, the limitation is only on the classes, but not on the city.