See my profile page. Though Tetzel was never canonized, I do consider him the sole saint in the whole sordid Luther affair.
Did you see the film "Luther" starring Joseph Fiennes? The character of Tetzel did not come off very well in that film, or in history. Witness Tetzel's supposed comments, "The coin in the coffer rings, The soul from Purgatory springs" and something to the effect that even if a man would violate the Blessed Virgin herself, he could be freed from purgatory.