User blog comment:B214/Season 3 confirmed!!!!!!/@comment-24.104.16.50-20150329203404/@comment-3965848-20150330060940

There are only 8 official girls in his harem so it's at least 8 or more kids. As for Ophis I think it ment that she was born gendeless but as a shapeshifter, she is able to morph into being male or female, so there is also a chance for her to officially join his harem.