I'm planning to do a DSA (The Dark Eye) campaign. I told the players what characters I need in the campaign (at least one character strong in fighting, one in socialising with royals, and so on).
The problem now is that the players presented their concepts to me and I know that they don't match the fundamental requirements for this campaign. I said that to them, and they said I should then change the campaign so they can play what they want. But these changes would change the campaign in a way that changes everything inside it, which is not possible (at least not for this campaign).
How can I deal with this situation so that everyone is happy?
Problem fact is, the "normal" playing time is about 5 years.
I do the answers to the questions in answers or comments here:
First: yes, the average time to finish the campaign is about 5 years.
Second: I have talked to my players to find a consens. They want to play this campaign, I want to play it with them, so we decided to do a meeting to clarify what I need to play and maybe find ways their favorite characters can be played. I know that not everyone can play their favorite characters, but I think everyone can find a character they like to play. I also asked them to think of alternative concepts which are completly different to their actual concepts so we can take one of their concepts.