Those 'best of' lists from 2020 always bring me back to a few that genuinely stuck. For me, the standout was Tamsyn Muir's 'Harrow the Ninth'. It's a wild sequel that completely inverts everything you thought you knew from 'Gideon the Ninth'. Harrowhark Nonagesimus is a protagonist defined by staggering, self-destructive grief and obsessive magical intellect. She's not 'strong' in a conventional, physically powerful sense; her strength is a fractured, terrifying will to impose her reality on a universe actively unspooling around her. The narrative itself is famously challenging, mirroring her fractured psyche, which makes her eventual moments of clarity so devastatingly earned.
A more accessible but no less brilliant pick is 'The Once and Future Witches' by Alix E. Harrow. It's a historical fantasy set in an alternate 1890s where witchcraft is a suppressed, folkloric memory. The three Eastwood sisters—James, Agnes, and Beatrice—each wield a different kind of strength: scholarly grit, righteous fury, and healing resilience. Their fight to reclaim magic is deeply intertwined with the suffragist movement, making their strength explicitly collective and political. The prose is incantatory and beautiful, and the sisters' flawed, fraught relationship is the real heart of the power here.
I'd also toss in 'Network Effect' by Martha Wells, the first full-length Murderbot novel. While Murderbot is agender, its narrative voice—cynical, anxious, and fiercely protective—resonates with many readers seeking protagonists who defy traditional heroic molds. Its strength is in its capacity for connection despite its programming, a deeply relatable arc. And for pure, world-shaking scale, 'The City We Became' by N.K. Jemisin features multiple protagonists, but the women like Bronca and Neek are incredible forces of cultural memory and defiant creation, literally battling cosmic existential threats. That book is a manifesto in narrative form.