Grazie for your question, anon! We were curious about this, too. We had to use a third party script that counts the tags to figure this answer out. Currently, our reigning King of Dirty Confessions is Connor (as expected ;D) The current Top 5 are:
1) Ratonhnhaké:ton / Connor Kenway
2) Ezio Auditore
3) Altair Ibn-La’Ahad
4) Edward Kenway
5) Jacob Frye