Along with David Harbour, 2019 breakout star Florence Pugh will be playing Natasha’s “sister” Yelena Belova. Pugh turned heads with her roles in Fighting With My Family, Midsommar, and Little Women, which earned her an Oscar nomination. Rachel Weisz is also on board as Melina Vostokoff after a recent role in The Favourite, also honoring her with a nomination from the Academy.
Article source: https://www.cinemablend.com/news/2492611/why-black-widow-david-harbour-thinks-red-guardian-is-the-mcu-best-character