I also immediately thought of Fischl the moment Furina opened her mouth. I really love her character and her EN VA is doing an excellent job. Saving up for her and Neuvillette for now.
Pretty great so far. It looks small on the map but the city is pretty huge. Haven't explored the area completely yet since I just finished the first chapter (which wasn't so bad).
I think Furina is a lot more bratty them Fischl. I hear people compare, but I don't really get it except how the voice actors kind of give off that high-and-mighty princess persona.