Killua/Sir-A is an Albanian recording artist, producer, and songwriter. Killua was born as Aris Demaj into an ethnic Albanian family. Demaj caught national attention in the Albanian-speaking Balkans in late 2021, upon the release of "Bageti e Bujqësi" as the lead single from his upcoming debut album, Metamorfoza. The single's title is derived from the poem of the same title written by Albanian poet Naim Frashëri in the 19th century. It peaked at number 2 on the Albanian Top 100 in early November 2021 and rose to number one a week later. Prior to its solo success, Demaj was featured on Albanian disc jockey Arnon's successful "Te Molla" in August 2018. The Albanian-language song became a top 15 single in Albania and reached number 13 in the Commonwealth of Independent States. Aris released the Album "Rrno per me Tregue" under his other alter ego Sir-A.