Daguza is an enemy in Final Fantasy XII. He was the seeq warden of the Nalbina Dungeons. He and his two comrades often beat the prisoners, and even severely beat a bangaa, possibly to death, right in front of Vaan. Vaan tried to stop them, but was thrown into the fighting pit in the dungeons.
Eventually, Balthier came to his rescue, and they both, unarmed, beat up the abusive seeq guards. Daguza and his team are not added to the Clan Primer, probably because of it being taken along with your party's other possessions. Thus, they do not count towards 100% completion for the Clan Primer.