Looking at the picture of giant loli KK and thinking back to her comment to Mikhail in ep7, I'm wondering how it's even possible for anyone to miss a giant the size of a small apartment building
[with big hair to boot]. No wonder she keeps ribbing him on it.
Considering the time scale since the coming of the human-zent hybrids, I'd say that Mikhail may be a 3rd generation [or 1/8 zentradi] with sufficient genetic dilution for male and female children to be born to the parents. It use to be set up that the children have to follow the sex of the zent/melt parent. Could also be why he isn't in macro form, too far removed from the template.
The parents have to be quite young though, like late teens in order to have a 3rd generation in less than 60 years. Who knows, discovering culture and facing extinction has likely made society rather frisky.