Kleio - Danai Othoneou was born in Thessaloniki where her parents studied and is the older sister of their three daughters in total. At the age of just two, the family moved to Xanthi, her mother's place of origin. There begins instrumental gymnastics and the first piano lessons at the National Conservatory of Xanthi, at the age of 5.5 years. A few years later, they move and settle in Athens (Holargo), her father's place of origin.