Wewel performed over 80 roles, including Osmin in Mozart's Die Entführung aus dem Serail, the Komtur in Don Giovanni, Sarastro in Die Zauberflöte, Rocco in Beethoven's Fidelio", Philipp II in Verdi's Don Carlo, Gremin in Tchaikovsky's Eugen Onegin, Daland in Wagner's Der fliegende Holländer, Heinrich in Lohengrin, Marke in Tristan und Isolde and Titurel in Parsifal. He also performed in operettas.