The nature of the people of frankfurt

I would like to know the nature of the people of Frankfurt or Germany in general.I am totally open minded to different cultures and I would like to know how other expats moving to Germany adapted and how people responded to them.

Your question is rather wide and, in my opinion, cannot be answered in a forum like this.
There are whole books written on the topic. Maybe you would like to read some of them and come back with more detailed questions, which then we're happy to answer!