Ms Le Pen is taking her case as "the people's candidate" to the working-class suburb of Villepinte.
"Patriots from different currents can now gather to defend their country".
Ms Le Pen has promised a referendum on France's membership of the European Union and said this weekend that the "euro is dead", although she has toned down calls to swiftly leave the single currency.
Le Pen supporters are equally adamant, with some seeing her as a savior for a ravaged land.
At a rally Monday in Paris, Le Pen went off on an ode to France's geography, and how it links the country to cultures from around the world from "the enormous Hispanic and Latin world" to "Italy our sister", and then boasted about how people from Mexico to Shanghai seek to learn French. However, he also tried to convince those people who are looking to abstain from voting, which pundits believe could be a major factor in Sunday's vote.
Mr Fillon has urged voters to back Mr Macron.
Couteaux has past links to both Fillon's campaign and Le Pen, according to French media reports.
The National Front (FN) candidate's team was unrepentant, however.
Mr Macron will seek to consolidate his lead with a future-oriented message of optimism to an electorate wracked by unemployment and fears of globalisation in a meeting near La Villette science complex in north-east Paris.
"I will fight up until the very last second not only against her programme but also her idea of what constitutes democracy and the French Republic", said Macron.
"He wants to dynamise the economy, but he is among those who dynamited it", the elder Le Pen said, referring to France's stagnant economy and jobless rate of around 10 percent.
Thousands of French union activists are marching through Paris and other cities to demand that France's next president protect worker rights - but they appear divided about how to cast their vote.
Florian Philippot, the deputy leader of Le Pen's Front National party, said the party "completely owned up" to the fact that the speech resembled one made by Fillon a month ago. Macron, who has pulled support from the right and the left, said candidates will have to quit their parties to run under his 1-year-old informal political movement for parliament seats. In the graphic novel, Durpaire looks at how a Le Pen presidency would interact with U.S. President Donald Trump and Russian President Vladimir Putin also predicting riots and trouble in France. "Macron (equals) Louis XVI, Le Pen (equals) Le Pen", read another.
The National Front traditionally holds a march in central Paris on May 1 to honor Joan of Arc, and at the 1995 event, a group of skinheads broke away and pushed 29-year-old Brahim Bourram off a bridge into the Seine River, where he drowned. "One of them is a candidate who will uphold republican values and one is not". He told supporters that "Emmanuel Macron is doing a tour of graveyards".
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