Bastard!! Ankoku no HakaishinBastard!! Heavy Metal, Dark Fantasy - Hagiwara, Kazushi

In a post apocalyptic world of heavy metal fantasy, the only thing able to save humans from orcs, lizard men, and other monsters is something even MORE evil. Sealed within a 14-year-old boy, the chaotic wizard Dark Schneider is unleashed to fight four mighty generals and their plot to resurrect the evil god Anslasax!

(Source: VIZ Media)
Included one-shots:
Volume 1: Wizard!!: Bakuen no Seifukusha (pilot)
Volume 22: Binetsu Rouge
Volume 26: Virgin Tyrant

Bastard!!: Ankoku no Hakaishin was first published in English as Bastard!! Heavy Metal Dark Fantasy by VIZ Media, who published the first 19 volumes from August 5, 2002 to September 8, 2009, before dropping the license.