Mbulu ngulu (reliquary guardian figure)

Mbulu ngulu (variants: mbuiti, moungou ndokou in some dialects; the term is most consistently glossed as 'image of the dead') is the term used across Kota subgroups for the figural crown of the bwete reliquary basket. The figure consists of a minimal carved wood core — essentially a face, neck, and abstract lozenge body — entirely sheathed in hammered copper and brass sheet and strip. The face is rendered in a single convex (or, in Mahongwe examples, concave) plane, framed by a projecting lunate coiffure. The lozenge base was inserted into the basket's upper opening so that the figure stood sentinel over the ancestral remains within.

In its original ritual context, the mbulu ngulu was not a decorative object but an activated presence: it was rubbed with protective substances, addressed in speech during bwiti ceremonies, and understood to embody the accumulated power of lineage ancestors. Fieldwork by Louis Perrois established that individual figures could represent a composite of several generations of ancestors rather than a single named individual. The figure's removal from its basket in the colonial period severed this relational identity, and the vast majority of mbulu ngulu in Western collections have been separated from their associated relics since their initial acquisition.