Asamat Kudzayev was born in Vladikavkaz in 1990. He chose his pseudonym MiyaGi after Mr. Miyagi, who trains the protagonist in the film Karate Kid. His father Kazbek Kudzayev is a well-known surgeon, head of the Centre for Orthopaedics and Aesthetic Surgery in North Ossetia. At the age of seven, Asamat Kudzayev fell under a tram and was seriously injured; his father operated on him. Like his father, Asamat went on to study medicine. While at school, he started listening to American rap and took a liking to the genre. He also started writing his own lyrics. In 2011, he recorded his first track and performed his first solo concert in 2015.
On 8 May 2016, he and Endspiel released their first album together, "Hajime Pt. 1". Shortly after on 20 September 2016, the next part "Hajime Pt. 2" followed. In 2017, a joint album with Endspiel was released under the title Umschakalaka (умшакалака), which was a collaboration with the singer Amigo.
MiyaGi has an older brother and lives with Ilona Tuskayeva in Saint Petersburg. In 2017, his one-and-a-half-year-old son died after falling from a window on the ninth floor.