Just to say, the existence of both Cait Sith and Cu Sith was indicated in the MGE-1 book years ago. They were given as examples of "Pets who were loved enough to become monster girls", or some such, and as a consequence of this, are more "Beastly" than average.
They were the only two listed, so it's likely they're the only two he'll bother to do profiles for, and we'll never see any other furries from him.
Look Kenkou, if we a doggy, we go and get a kobold. Those are adorable. We want monster girls, not furries. Do you understand, Kenkou? Because it is very important that you understand.
If Kenkou really cared about our opinions, he would make lesbian and futanari monstergirls possible in his vanilla setting.