William Larsen was born in Stockholm, in 1996. He is a trained guitarist and performer, currently pursuing a bachelor's degree in musical arts at the University of Örebro, with graduation expected in May 2024. He has also completed a year of studies at the Federal University of Paraíba, Brazil.
He has worked as a musician, composer, and has performed live as a guitarist on stages in Sweden and abroad. William has collaborated once before with the actor Lindy Larsson in the theatre production Aurora Borealis, which toured in India in 2019.