Belize Nicolau Kazi was born in 2002 and raised in
Barcelona. She worked as a
child model, starring in an advertisement for
Nesquik and appearing on the cover of
ESO books, and as a child singer in the group Oh!Cake & The Cookie. She is Spanish, from Cataluña; her mother is Canadian of Bengali descent and works as an
acupuncturist and practitioner of
traditional Chinese medicine and her father, who she spent less time with growing up, is a DJ and record producer who goes by An Der Beat and plays
Brazilian funk music. She has said that she was bullied while in school. In September 2022, Kazi decided to start rapping professionally under the name BB Trickz—derived from
Beatrix, the name of the protagonist from the 2003 film
Kill Bill, which Kazi's mother allowed her to watch as a child as a birthday present. A snippet of her song "Bambi" posted to
TikTok in February 2024 went viral. She released "Missionsuicida", her debut single, on 15 April 2023 with an accompanying music video. The song samples the theme song of the television series
Law & Order: Special Victims Unit and gained popularity on
TikTok, as did her follow-up single "Bambi". Soon after, it was announced that she had been signed to
Virgin Music Group. Her debut
extended play (EP),
Trickstar, was released nine days later through Virgin, with its beats all downloaded from
YouTube. Her first live performance was at
Rolling Loud in Portugal in July 2023. She appeared in
Veeze's music video for his song "Overseas Baller", released in August 2023. She released
Sadtrickz, her second EP, on 29 November 2023 through
Sony Music. In April 2025, Kazi appeared on a Spanish-language podcast where she said she could learn from
Donald Trump and
Adolf Hitler. ==Musical style==