Two things, first off if to activate a curse you have to pay compensation does that mean that since the demon kings curse turned monk into a child, changed knights sexual orientation, chromes gender, and made hime sucumb to darkness that he has become younger, changed gender, had a change in sexual orientation, and given up his darkness as compensation.
And secondly if all four curses were put on person does that mean that they would become an evil, genderbent, sexual floozie, of a child.