Upvote:3
To answer your listed questions:
For us to be able to answer your actual question, whether you'll be able to actually travel with this booking, we need more information as others have stated in the comments:
Probably doesn't help you with the exact question, but it is a good read anyway in case of problems along the way: Q: What does the “Kiwi.com Guarantee” cover?
You will probably need a visa.
Since your booking is split over your flights, it can be argued that it TWOV does not apply to you. You do have all the flights on one e-ticket, but I don't know if that's sufficient. But what's worse, your flight GRU - Belem is a Brazil domestic flight. It is very likely that TWOV doesn't apply to domestic connections at all. This might also mean that a "airport transit visa" - if such exists in Brazil - isn't sufficient either and you have to get a full visitor visa; this would be the case in Germany for example.
Timatic says:
Brazil - Transit Visa
Visa required. Transiting without a visa is possible for:
Passengers with a connecting flight booked on the same ticket in transit.
This TWOV facility does not apply at Curitiba (CWB), Florianopolis (FLN), Porto Alegre (POA), Porto Seguro (BPS) or Salvador (SSA).