Pontius Pilate. Up to a point he was just another Roman Governor, just doing his job, being a hard-ass at times, and sometimes not. Unfortunately for himself though he went along with the crowd at the wrong time. Judas gets a strong second place. JMHO. Could go on and on about it but where would one stop?
According to the Ethiopian Orthodox and Coptic Churches, Pilate was so burdened with guilt that he converted to Christianity and is regarded as a Saint (as is his wife St. Claudia).