5) Is futanari monster girl in fan fiction okay? Will there ever be Futanari monster girl?
OK! There may be such Mgs in the world of MGE, and the magics or portions by sabbath may enable them. But sorry, I won't let them show up officially.
KC said that there may be mamonos endowed with the masculine "tool", but would that be a canon? As this would not be against the very rule of the Demon Lord in which all monsters have become women who specialize in giving pleasure to human men.