Change!! Getter Robo: Sekai Saigo no Hi, Mazinkaiser SKL Recommendations
Both are modern adaptations of classic super robot anime, which basically defined the whole genre. Both focus on violent and hot-blooded main characters who fight against powerful foes. Both have a similar feel and plot elements, and were originally created by Go Nagai (although Getter Robo is a collaboration between Go Nagai and Ken Ishikawa).
GORE, MANLY, WOMANLY, SUPER ROBOTS ULTRA RULE OF COOL