We give an overview of current research questions pursued in connection with an ongoing project on nominal classification systems in Africa, with a particular focus on Niger-Congo. We first introduce our cross-linguistically applicable methodological approach which provides new insights into the design of a range of gender systems on the continent. We then apply these ideas to the “noun class” systems of Niger-Congo. We focus on non-canonical phenomena of poorly known languages, which attest to an unexpected systemic diversity beyond the well-known Bantu type and promise to change the synchronic and diachronic perspective on the gender systems of this family.