Monse Finnie is played by Sierra Capri
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Netflix's 'On My Block': Meet the season 3 cast

2. Monse Finnie is played by Sierra Capri
Sierra Capri plays Monse Finnie. The role of Monse is the twenty-something’s very first on-screen starring role. She also played an extra in 2016’s “Hidden Figures”. When Netflix began casting, she was living in Atlanta, Georgia, after having completed her junior year as a biology major at Armstrong State University in Savannah, Georgia. Her birthday is on September 11, incase you wanted to know…