User blog comment:Unfortunate Mermaid/Succubi: So Interesting That they Are Boring/@comment-5349531-20120813095612

The greatest weakness that I see in MGQ is that of reproduction. There supposedly aren't a lot of succubi and their only way of reproduction, that is explained, is by turning human women into succubi once a blue moon.

It is never explained whether a succubi can have a child with a human male or not and none of the succubi actually mates with Luka. This leads me to believe that while succubi are incredibly powerful in the MGQ universe, they are rare.