True.  It's just that the prospective champion can't be inherently good or inherently evil when the templates are applied; That is, if we want said champion to have both templates, he can't be born either good or evil.  He'll have to be born neutral, and then we'll have to shift his alignment afterwards.  So, no half-fiend celestials or half-celestial fiends, because they've got good and evil as core parts of their natures, as reflected in the alignment subtypes they've got.<br/><br/>To put it differently, neither Astaroth nor Aikaterine could get Bellona pregnant, nor could she impregnate either of them.  Any half-mortal children of any of the three of them, on the other hand, would be fair game.