Aaaaaaa this is too good, using the perfect blend of cool, clever and silly against the most powerful enemies, as usual! Can't wait for the next chapter!!
Uncle really remembers his promises. "Sui" can only be said if Uncle and Elf are the only ones in the room, so he really shouted "SUZAILGILLZZEGALLNELBUZEGILLREARGRANZELGA!!!" just to wake Elf up ( dragon girl and dark knight in the room ).
I can't shake the feeling that this will end extremely poorly... I am thinking that he made himself forget something heartwrenching when he was about to return to earth, and he will play it back and see it all over again.