Canadian Prime Minister Justin Trudeau said he wanted to work together with Macron on a "progressive agenda" to "promote worldwide security, increase collaboration in science and technology, and create good, middle-class jobs on both sides of the Atlantic".
Another elder stateswoman pleased by Macron's victory was former USA secretary of state and Democratic Party presidential candidate Hillary Clinton, who tweeted: "Victory for Macron, for France, the European Union, & the world". But a high number of blank or spoiled votes and an unusually low turnout are signs of an electorate dissatisfied with its choices.
En Marche! was founded by Macron in April 2016, a few months before he resigned from his post of the minister of the economy.
Macron campaigned on pledges to cut state spending, ease labor laws, boost education in deprived areas and extend new protections to the self-employed.
"I will be a candidate in the presidential majority and I wish to join up to his movement, namely the "Republic on the Move", Valls told RTL radio.
He left the Socialist government in August and formed En Marche! "We shall see", Jean-Claude Mailly, secretary general of the hardline leftist Force Ouvriere union told France Info radio.
Her score this time round was almost double that of her father when he shocked France and the world by making it into the second round of the presidential election in 2002, in which he was ultimately defeated by Jacques Chirac when left- and right-wing voters joined forces to keep the extreme right out of the Elysée. Russian Federation is also accused of launching hacking attacks on Macron's campaign in an effort to support Le Pen's candidacy. He has previously said he would like to appoint a woman.
French President-elect Emmanuel Macron has appeared by the side of the man he is succeeding as the country commemorates the end of the Second World War.More news: Marcus: Why didn't Trump want anyone to hear his conversation with Comey?
Among others floated as potential premiers are Xavier Bertrand, a veteran of the Republican who heads the Hauts-de-France, and outgoing Defense Minister Jean-Yves Le Drian, who after Macron's win urged France to "come together and be united in this hard period". "I will do everything in the next five years so that they have no more reason to vote for extremes", he said.
"There was a big issue of branding the Front National because the Front National, still the French do consider that the Front National is not a party like another one, I think that most French have still in their memories the provocation of the time of Jean-Marie Le Pen".
On Friday night, an hour before a French media blackout ahead of the vote, a cache of hacked En Marche! files, reportedly mixed with some falsified documents, were published online in an attack that bore some of the hallmarks of the hack on the Democrat party in last year's USA election.
This could give the National Front a significant increase on the two seats the party now holds.
Macron, the youngest French leader since the Emperor Napoleon, will take office on May 14, 2017.
In his first speech after the results were announced, Macron vowed to bridge the divisions that had led such a large portion of voters to cast "extreme votes".
Despite the joy and sense of relief many felt in France when the outcome became clear Sunday night, the picture is not all rosy.