User blog comment:B214/Volume 21 info & spoilers/@comment-191.82.149.185-20160704214534/@comment-24.113.252.213-20160708060143

OH!! I just thought of this.

You know how Ishibumi is a fan of Dragon Ball and took inspiration from it while writing the Highschool DxD series?

Let's compare Issei Hyoudou's power-ups and abilities to Son Goku's power-ups and abilities:


 * Balance Breaker = Kaio Ken


 * Illegal Move Triaina & Cardinal Crimson Promotion = Super Saiyan Transformations (1, 2 & 3)


 * DxD G (Nerfed) = Super Saiyan God (The Red-Haired form)


 * DxD G (Fully Mastered) = Super Saiyan God Super Saiyan (The Blue-Haired form)

Think about it :3