Upon the Japanese invasion of the Philippines in 1941, local film production was halted, allowing bodabil to thrive as the main source of public entertainment.
Along with such actors as Rogelio de la Rosa, Norma Blancaflor and the comic team of Tugo and Pugo, Casimiro would perform at the Life Theater in Manila for the duration of the war.
Often cast as a grandfather, a town sage, or even as a corpse in the Chiquito vehicle Estong Tutong (1983), his thin frame and befuddled look lent to easy ridicule.
[8] Bayani Casimiro Sr. died on February 27, 1989[9] in Manila, Philippines and he has a final resting place at the Loyola Memorial Park in Sucat, Paranaque City.
His most prominent role in later years was as the father of Enteng Kabisote (Vic Sotto) in the popular sitcom Okay Ka, Fairy Ko!.