Zig powermaster
Glorya (and apparently other Arborian Dryads) is an exception to the general rule.Different kinds of inhumans can interbreed, but the resulting mixed-blood offspring will only show traits of one inhuman type (and will look closer to humans than pureblood inhumans).After this, the rule is never referenced again. which, because both are incompatible types, was slowly weakening the resulting fusion and would cause its eventual death. Yugi defeats Kaiba's Blue-Eyes Ultimate Dragon by fusing his Mammoth Graveyard (an Undead-type note localized as "Zombie-type" in the TCG but it's a Dinosaur-Type in both, OCG and TCG) into it. Normally Yu-Gi-Oh! allows just about any two summoned monsters to be fused together however there is one interesting case where this trope is played disturbingly literally in the first tournament.She's apparently normal, with no traits of either, until she develops retractable fangs anytime shes bites something with them she turns into that object.
In Tokimeki Tonight, protagonist Ranze's father is a vampire and her mother is a werewolf.The Big Bad is a pure blooded wolf beastman who wants to wipe out all of the beastmen with mixed ancestry because he sees them as inferior beings and not real beastmen.
And it later turns out that different kinds of Beastmen breeding results in offspring that are weaker.