> How are they being received generally in Brazil?
Very well. Not only BYD but also other brands like GWM and Geely.
> What kind of vehicles are people replacing with BYDs?
Combustion cars with the same price, they are not replacing other electrical vehicles because the Chinese brands are way cheaper yet they are good cars.
> I always assumed Brazilians drove mostly "legacy" VW or Nissans
Nowadays we have many models from different brands.
In the past the fleet was basically VW, Ford, Chevrolet and Fiat. In the late 90s and early 2000s the Japanesne (Honda, Toyota and Nissan) and French (Renault, Citroën, Peugeot) became popular, and then Hyundai also became a success here. Recently, the Chinese brands are becoming more popular, especially Chery and the ones that I mentioned before.
> including the ID.4
But I never saw it here, even though VW is a very popular brand here.