Multiple parties that eventually devolve into a two-party system, for decades it was PT-PSDB until PSDB imploded, now it's PT vs whatever the right/center coalesces into(MDB for decades, PSC after that, now PL). In fact it's more of a two-personalities system at this point, with the right clinging desperately into Bolsonaro's fading popularity while the left clings onto Lula's image as much as they can after failing to make any successor popular.
And after elections, yes, it just turns into negotiation with center parties that will sell off their support for vote-buying projects.
And after elections, yes, it just turns into negotiation with center parties that will sell off their support for vote-buying projects.