>>289179
Because i'm too lazy to go look for it and since I saved the discussion, here you go. Double spaces separate each response.
I went with a slightly more biological approach. Even made some punnett squares at work. You should all be familiar with the x and y chromosomes (xx=female, xy=male). I then added H for human genetic code and M for mamono genetic code. HxHy woukd be a human make, HxHx a human female, and MxMx a pure mamono. What comes out of this are the hybrids MxHy and MxHx. I set my system up so that the y chromosome and the code connected to it takes priority, followed by M code over H code for females.
Now for the hybrids. MxHx, following the priority I mentioned, creates a female that looks close to a pure mamono. Anyone paying attention however would notice the hybrid's features aren't as fully defined as a pure mamono. For example, a hybrid red oni would have a slightly lighter skin color, less pronounced horns, and while she will be strong, there will be a noticeable gap between the hybrid and pure.
MxHy would look more like a human male, but would have some traits from the mother's monstrous side. Continuing the example of the red oni, the male hybrid will look human, but have a slight red pigmentation of the skin, increased strength, and at the most, very small nub-like horns. You might just call this hybrid a genetic incubus.
Now for species with female majority or only females, hybrids would be very common to continue existence. Therefore a human daughter wouldn't be that much of a surprise.
Included are my squares for reference.
HxHy x HxHx
Hx Hx
Hx HxHx HxHx
Hy HxHy HxHy
50% Male Human, 50% Female Human
HxHy x MxMx
Mx Mx
Hx MxHx MxHx
Hy MxHy MxHy
50% Female Hybrid, 50% Male Hybrid
HxHy x MxHx
Mx Hx
Hx MxHx HxHx
Hy MxHy HxHy
25% Female Hybrid, 25% Female Human, 25% Male Hybrid, 25% Male Human
MxHy x HxHx
Hx Hx
Mx MxHx MxHx
Hy HxHy HxHy
50% Female Hybrid, 50% Male Human
MxHy x MxMx
Mx Mx
Mx MxMx MxMx
Hy MxHy MxHy
50% Pure Mamono, 50% Male Hybrid
MxHy x MxHx
Mx Hx
Mx MxMx MxHx
Hy MxHy HxHy
25% Pure Mamono, 25% Female Hybrid, 25% Male Hybrid, 25% Male Human
The calculations are good. Now make Mx a recessive gene, and it's effects get masked by the H genes. Then,
MxHx would look almost completely human, but be more vulnerable to monsterise into their parent species, which would depend on the Mx gene source.
MxHy would be regular, run-of-the-mill humans, with very slight monster traits. Perhaps their spirit energy changes flavor to attract parent species of monster preferentially, like the incubus of KC.
Now here's how it works-
If a holstaur gave birth to a human female, the child would be MxHx, where the Mx gene comes from the monster mother. This girl is more likely to monsterise into a holstaur. If the holstaur gave birth to a boy, MxHy, the boy would attract other holstaurs as he gets older, more than other monsters.
Note that monsters can only be born when the child has MxMx genes. And since hybrid girls monsterise later anyway to their parent species, that solves all possible problems, like a human giving birth to a monstergirl, and monsterboys, and everybody knows that both are heresy.