Ches'sarro Seeto was a Bajoran collaborator during the Cardassian Occupation of Bajor. His name was the first to appear on a list of collaborators held by Vaatrik hidden in his chemist's shop aboard Terok Nor.
During Rom's attempted recollection of the list, he recalled his name as Ches'so, from which Kira was later able to determine as Ches'sarro. Ches'sarro was murdered after Odo began questioning Vaatrik Pallra about his identity. (DS9: "Necessary Evil")