Prime Ministers of Canada
Stephen Harper (Conservative) 2006 - 2015
-06 (min.): Paul Martin (Liberal), Gilles Duceppe (Bloc Québécois), Jack Layton (New Democratic)
-08 (min.): Stéphane Dion (Liberal), Gilles Duceppe (Bloc Québécois), Jack Layton (New Democratic), Elizabeth May (Green)
-11: Jack Layton (New Democratic), Michael Ignatieff (Liberal), Gilles Duceppe (Bloc Québécois), Elizabeth May (Green)
Thomas Mulcair (New Democratic) 2015 - 2021
-15 (min.): Stephen Harper (Conservative), Bob Rae (Liberal), Gilles Duceppe (Bloc Québécois), Elizabeth May (Green)
-17: Maxime Bernier (Conservative), François-Philippe Champagne (Liberal), Mario Beaulieu (Bloc Québécois), Elizabeth May (Green)
Rona Ambrose (Conservative) 2021 - present
-21 (min.): François-Philippe Champagne (Liberal), Thomas Mulcair (New Democratic), Niki Ashton (Progress), Sylvain Gaudreault (Bloc Québécois), Dimitri Lascaris (Green)
Patrick Brazeau wins his fight against Justin Trudeau in 2012, shattering the latter's growing perception as a rising star and leadership material, clearing the way for Bob Rae to graciously step in and assume the job unopposed. This benefits the NDP, who emerges as the main anti-Harper party come 2015, forming a minority government with the support of the Liberals. The NDP, lacking a natural base of their own, borrow the Liberal's long enough to form a minor majority of their own, thanks in part to the dubious campaign put forth by Maxime Bernier and the Tories. But the New Democrats, finally in charge without having to worry about fighting an election around every corner, fall into infighting, with a number of their more left-wing members unable to adapt to the party's growing moderation. Niki Ashton, the leader of the instigators, abandons the party, calling it a sell out, and starts up her own left-wing rival which she dubs the Progress Party. Through defections, resignations, and by-election loses, the government falls to a minority, further complicating the government's handling of the COVID-19 pandemic response. Confusion, disorganization, and public bickering with the provincial governments plasters the headlines and dominates the news coverage. Still, most expect a tough political operator like Mulcair would get re-elected, aided by the rally around the flag effect that had benefited other incumbents. In an upset the Tories, under former interim leader Rona Ambrose, form a minority government with the New Democrats narrowly falling to third place.
I don't know, just a fun idea I had.