Board Thread:General Discussion/@comment-35898511-20190927060824/@comment-27045866-20190927072416

Most of this can be found in specific entries or the Q&A

Some bird and reptilian montsters do lay eggs, including smaller infertile ones.

37) Do oviparous monsters lay unfertilised eggs? If they do lay them, will they get angry of you eat one.[38]
 * They lay them. And they won't get angry if it's an unfertilised egg. By the way, the monsters in this encyclopedia will be pregnant for some time even if they lay eggs. So if there's a period where they are pregnant with rather big ones, then the eggs will be fertilized, if they are rather small and without a period of pregnancy, then the eggs can be easily told apart as unfertilised ones.

"Q: Do Dragons give egg births? Would they lay infertile eggs? If so, what would happen to their hymens?

A:Dragons lay eggs after some period of pregnancy. (Meaning they would have baby bumps even though they give egg births!) Dragons don't really lay infertile eggs much, but once they get their hymens broken by their husbands they would sometime produce infertile eggs, and this goes same for the Harpies. (KC)"

Some plant mamono like the Alraune have seeds.

" While her petals are closed, she keeps having intercourse with the man repeatedly in order to produce seeds."

The Zombie entry itself is pretty clear on undead having children:

"Furthermore, although they appear to be reanimated corpses, if their womb was originally intact, or an individual has received a large amount of spirit energy resulting in the restoration of her womb, then it's even possible for them to have children. In that case, the children born will also be zombies. According to one theory, it is said that zombies aren't human corpses reanimated by Demonic energy. Instead, they're human corpses that have changed into a living race called zombies. "

and it seems pretty much all monsters can have children:

"Q:Can MGs like Automatons or Living Armors have babies?

A:They can. Also, they would be viviparous. (Will) Also, Automatons weren't built with the function to have babies originally. Rather, by using their husbands' semen as a power they have self-updated their bodies to develop necessary parts and functions for pregnancy. (KC)"

in a recent Q&A he has said:

"Q:How are MGs that have items attached to them (e.g. Genies or Cursed Swords) born?

A:They come out normally from their mother, but their items would suddenly appear one day! How peculiar! 3 year old Cursed Sword who suddenly had a sword grown out of her hand, which she used it to stab her childhood friend(effectively making them married), getting a praise from her mother. (KC)"

Lilith wasn't able to fully change the nature of the world and all monsters can only have female children until she gathers enough power.

"However, the settings that had been determined by the chief god weren't so weak that she could completely overwrite them with just that. A number of problems remained that the demon lord hadn't foreseen. Although their objective changed from killing and devouring flesh and blood, to mating and milking semen, the setting “monsters assault humans” remained. Additionally, since the setting “monsters are biologically superior beings to humans,” also remained, nothing but the monster girls who are both mothers and superior beings actually ended up resulting from the coupling of humans and monster girls, even though the demon lord had expected that the incubi, who are the males of the unified race, would also have been born."

but he has said:

"4. Question: Your native demonic kingdom will ultimately remain without people, because they will all become mamono and incubus. And, undoubtedly, the number of men for whom you can marry, will soon reach zero, until the boys begin to be born. Will the ruling elite take any countermeasures (besides hunting men in other places)?

Answer: You can go in search of a husband elsewhere or develop tourism and beautification of the kingdom so that people come from outside. There are many different actions to attract people to the right place. Although it is impossible to say for sure, it is quite likely that mammono will start having incuba before the death of the current generation."

Although incubi being born will never happen in the setting itself as it ruins the whole trope of monsters going out and looking for husbands.