Who do you consider to be "Mr. Thou"?

[Avarice-ness]

Sabin is Mr. Thou. But it's not surprising people would say Cyan, since Sabin tells Gau to call Cyan that.

Technically Sabin does tell Gau to call Cyan "Mr. Thou" when he says the whole bit about Mr. Thou being 'that one, OVER THERE' I still say it's Cyan though, just for the fact it's apparent that Gau was basically picking on Sabin and Sabin was getting annoyed. *points at the script she posted earlier.