- He has an older brother, a younger sister and a twin brother.
- He studied at a school for priests and sang in a choir for 5 years.
- Boris has a 3 octave leading bass-baritone voice reaching tenor and about 2 octaves of falsetto singing, making a total of 5 octaves of singing voice.
- He has dated American model Faduma Haye.
- Counts artists George Michael, Dua Lipa and Harry Styles as major career influences.
- One of his grandfathers, "Portokalski", co-founded the "Fiat" automobile manufacturer company and has a monument in Italy to him.
- His first name his parent's suggestion and means "Tiger" as well as "Man of God". He and his twin brother were named after kings Boris I and Alexander the Great.
- His native language is Bulgarian and he also speaks English with a British and American accent.
- As a child, he participated in chess competitions and considers chess to be the most exciting pastime outside of music.
- His favorite cartoon character is Spider-Man, and his favorite movies include The Shawshank Redemption, The Devil's Advocate, American Pie, Two Popes, and Chernobyl.
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