This study investigates characteristic features of Black South African English (BSAE) paying attention to the role of the Bantu language substrate system in the nativization process of the variety. Using prototypical features identified in previous studies and additional data from speakers of another Bantu language, Sepedi, this study examines the influence of first language features on morpho-syntactic, phonological, and discourse and pragmatic features. The results of the study show that Bantu language logic plays a pivotal role in framing the rules and systematic production of the BSAE features. It is therefore argued that developments in BSAE show that it has evolved into an endonormative variety in its own right and that it has future prospects for standardization due to the demographic strength and improved social rank of its speakers. Recommendations for language planing are offered in the end for adaptation to other comparable situations.