Johannes Maria Leenders Zwaan, better known as Soulja (ソルジャ, Soruja; stylized as SoulJa), is a Japanese hip-hop musician and songwriter best known for his collaborations with singer Thelma Aoyama, "Koko ni Iru yo" and "Soba ni Iru ne" – the latter of which was the former Guinness World Records holder for the best selling digital single of all-time in Japan (until it was superseded by Greeeen's "Kiseki"). He has worked with various Japanese singers, including Thelma Aoyama, Issa, Rola, and Misslim.
Source: “SoulJa”, English Wikipedia (CC BY-SA 4.0), excerpt