Alberich shows up in Rheingold, not in Walküre, then again in Siegfried, and finally in Götterdämmerung (while Hagen is sleeping, commanding Hagen to regain the Ring). At the end of the opera, Alberich along with the three Rhine maidens are the only key characters in Der Ring des Nibelungen that remain alive. Wotan seems to die at the end of Götterdämmerung when Valhalla goes up in flames, Fasolt from Rheingold dies in Rheingold, Sieglinde and Siegmund from Walküre die in Walküre (Sieglinde is at least dead by the time Siegfried begins, some 15–20 years later), Mime (from Rheingold and Siegfried) dies in Siegfried, Gunther and Hagen from Götterdämmerung both die at the end of it, and Siegfried (from Siegfried and Götterdämmerung) and Brunhilde (from Walküre, Siegfried, and Götterdämmerung) both die in Götterdämmerung.
Alberich shows up in Rheingold, not in Walküre, then again in Siegfried, and finally in Götterdämmerung (while Hagen is sleeping, commanding Hagen to regain the Ring). At the end of the opera, Alberich along with the three Rhine maidens are the only key characters in Der Ring des Nibelungen that remain alive. Wotan seems to die at the end of Götterdämmerung when Valhalla goes up in flames, Fasolt from Rheingold dies? in Rheingold, Sieglinde and Siegmund from Walküre die in Walküre (Sieglinde is at least dead by the time Siegfried begins, some 15–20 years later), Mime (from Rheingold and Siegfried) dies in Siegfried, Gunther and Hagen from Götterdämmerung both die at the end of it, and Siegfried (from Siegfried and Götterdämmerung) and Brunhilde (from Walküre, Siegfried, and Götterdämmerung) both die in Götterdämmerung.