Roger Blench notes that the Talodi and Heiban families have the noun-class systems characteristic of the Atlantic–Congo core of Niger–Congo, but that the two Katla languages have no trace of ever having had such a system, whereas the Kadu languages and some of the Rashad languages appear to have acquired noun classes as part of a Sprachbund rather than having inherited them.
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The Tagoi language is a Kordofanian language, closely related to Tegali, spoken near the town of Rashad in southern Kordofan in Sudan, about 12 N, 31 E. Unlike Tegali, it has a complex noun class system, which appears to have been borrowed from more typical Niger–Congo languages.
Talodi and Heiban had each constituted a group of the Kordofanian branch of Niger–Congo that was posited by Joseph Greenberg (1963); Talodi has also called Talodi–Masakin, and Heiban has also been called Koalib or Koalib–Moro.