In some of his first words to the nation as president-elect, far-right politician Jair Bolsonaro has promised to defend the constitution and unite a bitterly divided populace.
Minutes after he was elected, several worldwide human rights groups put out statements demanding that Bolsonaro respect Brazil's democracy. The conservative Michel Temer took over, but he was extremely unpopular, with an approval rating of just 2%. There were numerous reports of politically motivated violence, especially directed at gay people.
Guedes, who wants to privatize an array of state enterprises, said the new government will try to erase Brazil's unsustainable budget within a year, simplify and reduce taxes, and create 10 million jobs by cutting payroll taxes.
But in a sign of the challenges ahead, the hashtag #EleNaoEMeuPresidente - HeIsNotMyPresident in Portuguese - was the top trending topic on Twitter in Brazil on Monday morning.
Mr Bolsonaro went into Sunday the clear front-runner after getting 46% of the vote to Mr Haddad's 29% in the first round of the election on October 7, which had 13 contenders. More recently during the campaign, he's pledged to uphold democracy.
But many Brazilians are disturbed by his professed admiration of the 1964-1985 military dictatorship, and for offensive comments about gays, blacks, and women. He said that "we will shoot" Workers Party supporters and told "leftist outlaws" to either leave the country or find themselves in jail. He also pledged to realign Brazil with more advanced economies rather than regional allies, overhauling diplomatic priorities after almost a decade and a half of leftist rule.
With 99.83 percent of ballots counted, Bolsonaro easily defeated his rival Fernando Haddad of the left-leaning Workers' Party, who got less than 45 percent of the vote. I told him I'm certain his election will lead to a great friendship between our peoples and a strengthening of Brazil-Israel ties.
Dubbed Brazil's Donald Trump, his policies include loosening gun ownership laws and allowing police to use more force.
"You do not negotiate with terrorists", he added, referring to how the Palestine territories are mostly controlled by the terrorist group, Hamas. "Our country deserves the best". "Excellent call, wished him congrats!"
She also interpreted the results as a rebuke by Brazilians of "the widespread corruption and terrifying crime that flourished under far-left governments".
Political analysts and activists reacted to the news in grim tones.
Bolsonaro, who cast himself as a political outsider despite a 27-year career in Congress, is the latest of several leaders around the globe to gain prominence by mixing tough, often violent talk with hard-right positions.
More than 140 reporters covering the elections were harassed, threatened, and in some cases physically attacked, the Brazilian Association of Investigative Journalism (Abraji) found.
Along the way, Bolsonaro's candidacy also raised serious concerns that he would roll back civil rights and weaken institutions in what remains a young democracy. The State Department added that the US "look [s] forward to working with President-elect Bolsonaro in the coming years", in areas of mutual concern "to promote security, democracy, economic prosperity, and human rights".
Steve Schwartzman of the Environmental Defense Fund warned that Bolsonaro's promises about the environment would be "dangerous to the planet".
But he is also very much a product of a flawless storm in Brazil that made his messages less marginalised. The economy suffered a two-year recession and is only beginning to emerge, with growth stagnant and unemployment high.
Many observers predicted that a newcomer would emerge to harness the anti-establishment anger.
Bolsonaro rose in prominence amid disgust with Brazil's political system.
Despite spending three weeks in hospital, he didn't let his injuries keep him off his beloved social media accounts, where he kept up his virulent campaign.
"We will change Brazil's destiny together", he said in his victory speech - broadcast live from his home on Facebook, the platform he has used to campaign since an attacker stabbed him in the stomach at a rally on September 6.