@Flame: The fact that you had to pull those examples from multiple games proves my point. Also Gabriel has abnormal body proportions beyond those examples you posted.
@Shiroi Koumori: The succubus art was censored for the US release of SotN. That is the version he posted.
@Pfil: To clarify, IGA said that female protagonists in the series were hard to justify historically, more so as the games get chronologically older. This matches up with Shanoa and Charlotte being heroes in games that are much later in the timeline.
Also Legends has fundamental conflicts with many titles that came before it. The game was most likely removed from the timeline due to those many dates, events, and character ages that do not match the other games before it, not because Sonia was a female protagonist.
For the record, I don't think that in a fantasy series like this it is hard to justify a female protagonist at all. Most of the super powers are not gender specific (high spirituality, vampirism, etc) so it is completely valid that a female character could have been the one to have acquired them. If we can explain away things with "Dracula's Magic" then we certainly disregard historical sociological norms just as easily, if not more easily.
Despite this though, I don't particularly believe IGA is sexist. If that were true, we'd never see Shanoa and Charlotte see the light of day ever. On top of that, it does make an amount of sense that the focus is on the male heirs of a bloodline, the ones who pass the genetics, in a series concentrating on the lineage of a family. As a third caveat, we also know some developers are told by management that they CANNOT make a game with a female protagonist period. It could have been something out of IGA's hands entirely for quite some time.
All speculation of course. Take it for what it's worth.