Melinda May facts for kids
Melinda May has encountered an Inhuman at Bahrain and protected her. She was known as "The Cavalry" since then. She retired from the field until she was convinced by a resurrected Phil Coulson to return back to S.H.I.E.L.D.
Ming-Na Wen has played May in all her appearances in the MCU and other media.
Melinda May Facts for Kids. Kiddle Encyclopedia.