Okay, alt-text! After looking at a lot of the old alt-texts and comments by Ammika I have deduced [POSSIBLE SPOILER] that the boss is either Kululu from Keroro Gunsou, or the dragon-sage guy mentioned earlier. (Or both, but I kinda doubt that.)
Her! HER! HIM! You? Me? Why? How? Who? What?
Ding ding ding CORRECT! You win absolutely nothing.
@PrincesTomboy: Yay, I'll take my absolutely nothing, thank you!