Radi was born in a world called the "Muzix Universe", where certain inhabitants hold a superpower called a "genre ability". Individuals who wield this power have their own ability and music skills that derive from a music genre. Radi is one of the many who wield that ability, which was dubstep. When he was 5 years old while Lofie (radi’s sister) was an infant, Radi experienced his parents' death. Heartbroken and in denial, Radi promised to be there with Lofie and always protect her after hearing her cry, as she was the only family member he had left. Afterwards, Radi eventually developed thantophobia in fear of losing his sister. He and his sister lived in an orphanage throughout their childhoods.
Currently, he lives in solitude and is constantly on the run.
Sometime later in his life, Radi became friends with Void. Being a huge fan of Void, Sumire wanted to introduce Radi to his music, in which he successfully did so by dragging him to see it. To enhance both of their experiences, Sumire bought front row tickets to the concert. Once the concert started and when Void started his performance, the crowd cheered except for Radi, who appeared to be uninterested in the space humanoid’s display. This caught Void’s attention, in which he casted the spotlight onto Radi, much to the latter’s surprise, then challenged the Muzinx figure to a rap battle. The first match of the battle ended with a tie, however, as Radi starts winning over the purple figure in the last match, he noticed that Void’s fans feared for his defeat, especially his friend, Sumire, who was conflicted between his friend and his idol. Out of consideration, Radi purposefully lost the rap battle, leaving Void victorious. After the battle, Void spoke to Radi, thanking him for preserving his reputation. Radi replied that he had fun and that the white and purple singer should consider this a free publicity stunt. The duo smiled together and shook hands, acknowledging their passive rivalry, which then the crowd cheered again, especially Sumire who was the most ecstatic of the outcome after seeing their friend and idol become friends.