[3] Kusum Renu was born on 30 January 1961 in Colombo and completed her education from Anula Vidyalaya, Nugegoda.
Kusum Renu is married to Sriyantha Mendis, who is also a renowned actor and director.
[5] She met Sriyantha during the stage drama Pandukabhaya in 1984 and couple married on 25 October 1986 after the proposal in April 1985.
[8] Younger daughter Tharuki Amaya also acted in stage play Subha saha Yasa.
Her uncle Senadheera Kuruppu was a popular actor at that time, where she made her public acting debut.
In 1982 for Mandaram Wahi, Renu won four Certificates of Merit from National Youth Services Council.
She marked the comeback by winning Best Actress award at the State Drama Festival for the role in Deweni Mahinda in 1998.