Ok this was a hard one. Frist I was going with Aizen from bleach because he literally fool everyone in the Soul Society but I was thinking an other charcter did something like this but he didn't fool a society he fool everyone in his home town but one person who knew but couldn't prove it that's right Light Yagami.
Not only did light fool every he messed with people brains by passing the death note around. He even made a shingami kill L. Plus he literally did not care what he had to do to complete his goal.
Well that's day 9 next is favorite fighter.