At the age of five, she started taking piano lessons, something she continues to do to this day. Also, she currently takes vocal lessons as well. Jazz, Soul, Rock and Roll, and RandB are cited as musical influences. Her first favorite song growing up was "I'm Like a Bird" by Nelly Furtado. Apart from singing professionally, she is also a law school student in Athens. She has stated that she still aspires to finish law school, and not devote herself to music exclusively, even though her popularity as a musician is increasing. Her father (Epaminondas Papadeas) and sister (Romy Papadea) are also attorneys in Papadeas Law firm. Her mother Elena Boubouli is a Greek-American School owner of Masterlingua and Director of Studies for Epimorphosi Higher Education (medical studies abroad).
Demy first appeared in Midenistis' song, Mia Zografia which became a big hit in Greece and Cyprus. It received two awards from the MAD Video Music Awards 2012, the one for the best video clip Hip Hop/Urban and the other for the duet of the year. A new single, "Poses Hiliades Kalokeria" (How Many Thousand Summers) was released in June 2012 and quickly reached No.1 on the iTunes Greece song chart. The song also reached No.1 on the July 7, 2012 Billboard Greece Digital Songs chart, and remained in the top spot for 9 consecutive weeks, and 10 weeks in total. It also became a success on Greek radio, reaching #1 on the official Greek airplay chart. She also sings the lead vocals on Playmens' "Fallin". Some of her others songs include: "Pes Pos Me Thes," "Mia Zografia," "Mono Mprosta," and "Kratise Me." On June 25, 2012 she performed on the Greece, You Have Talent finale, singing a medley of her recent releases (Mia Zografia, Mono Mbrosta, and Poses Xiliades Kalokairia). On July 6, 2012, two new songs were released on YouTube: A "Poses Hiliades Kalokairia" dance remix, and "Love Light," an English language version of the "Poses Hiliades Kalokairia" dance remix. Both songs have also been released as digital singles. On July 30, 2012, the video for "Love Light" was released by Panik In the summer of 2012 she embarked on a tour that included performances in Greece, Cyprus and Russia. On July 28, 2012, Demy, along with Playmen, performed "Fallin" at the Europa Plus Live music festival in Moscow, Russia. The song has become popular in Russia, and has reached #1 on the Europa Plus Chart, the radio station of the organizers of the festival.On September 21, 2012, she made an appearance at the Amita Motion "Day of Positive Energy" music festival. She performed with other members of her record label. On October 22, 2012, her new single, "I Zoi" (The Life), was released. A 24-second teaser was released on YouTube on October 17, 2012. In December 2012, it has been announced that she will be starring in the musical "Fame" at the "Ellinikou Kosmou" theater in Piraeus. It is also her desire to one day record songs that she herself has written, but there has been no indication as of September 2012 that her first album is going to contain such songs.
Demy's first full-length studio album, No.1 was a released in late 2012 according to her record label. She had confirmed via Twitter on September 2012 that she was in the studio working on the new album. The album included ten tracks including two songs in English. The album also included her big hit in Greece with the Greek rap singer Midenistis "Mia Zografia"
In May 2013 Demy released a summer song in English called "The Sun", along with producer Alex Leon and Greek rapper Epsilon, and became a big hit in Greece
In March 2014 an official video was launched by Playmen which features Demy for the song 'Nothing better'. The song was directed by Yiannis Papadakos and was published by Panik Records.