User blog comment:Saikou The Lewd King/Ancestry Tree/@comment-34962159-20180913111026/@comment-36674939-20180913123541

It's difficult to say if the Six Ancestors are truly the progenitors of all the present-day monsters--I've always theorized that they were just the most prominent among the monsters born from Alipheese the First--with several other "lesser ancestors" like Pabilsags and such being the progenitors to their respective races. Because at some point, limiting every monster race to just being tied to one of the Six Ancestors results in some really questionable connections.

There's also another thing to consider; not all monsters are necessarily born either. Undead monsters like ghosts and zombies are created by magic influencing the souls of the dead. Dolls operate under a similar principle, being given life through magic. Paradox Part 2 shows also us that succubi are not just born, but can also be created through corrupting female humans with copious amounts of dark energy. While these are outliers, they're anoher thing to be considered...