The first group is the Brazilians. This is not the Lula supporters who joined when he did. They're the bots that arrived when Elon refused to pay petty fines and Twitter was banned in Brazil.
Brazil largely controls two types of bots: pretty picture (scenic stuff) ones built up to sell with inbuilt followers (and the fake followers themselves), and fan pages (with lots of fake followers, too, but the business model is different).
Unlike the Lula crowd, the Brazilian bots trend pretty fashy. But most of the Brazilians - real and not - have fucked off back to Twitter, leaving their accounts open but dormant.