UnrelatableAuthor
My guess is that when he has sold enough manga the system will give a new function that will allow Masashi to copy powers of one of the characters from different mangas, but the manga the chosen character is from will be put on a cooldown after being used. But the stronger the power is, the longer the cooldown is that could take about a year or even longer. It be too OP if Masashi used Golden Experience Requiem constantly.