Interacts with H-NS and in this complex might contact DNA, which could provide an additional surface for DNA binding to the H-NS-Hha complex; may not bind DNA in the absence of H-NS (PubMed:23515315). In vitro improves the ability of H-NS to bind DNA under a precise set of conditions (PubMed:23515315). Interacts with H-NS; crystal structures suggest each subunit of an H-NS dimer could bind 1 Hha monomer (PubMed:23515315). Derepression of genes that are usually coregulated by H-NS and Hha (PubMed:23515315). Belongs to the Hha/YmoA/Cnu family.