>>530085379
My personal headcanon theory is that yes, they can
Monsters canonically reproduce by attuning and combining their soul magic in an undescribed process. All living things possess a soul, while only monsters are capable of absorbing the soul of a human. How magic itself works is not really explained, but one could argue it's pretty much just picrel. I'd say it could be as simple as just attuning human and monster soul through analogous process as regular monster mating. The offspring, in my mind, is basically the same being as a monster that absorbed human soul. When it comes how they would look like, again, picrel. Probably dependant how the combining souls thing works
One additional aspect, some, but not all, monsters also mimic physiology of organic liveforms to some extent. This might not have any impact on the reproduction process in question considering how diverse the monster form is, but there may be some utilisation, since at least some monsters can eat, breath, blush, etc.