This is my first attempt at a Kelvic and I have only just started it, so I am obviously not an expert. I have long thought this would be an especially difficult race to play, although I suspect many people new to Mizahar think it will be easy (which would explain why so many new players start with a Kelvic). "Hey, I've got a warrior who flies!" sounds cool, until you remember that that's not really what you have. What you really have is a bird who can wield a sword. The order in which you say it matters.
But what I really want to comment on is the question raised a few posts back about what constitutes "a successful Kelvic." It's a pretty easy question to answer from an IC point of view. A successful Kelvic is one who is accomplishing his own goals, which will mostly revolve around serving and protecting a master or mistress. This sounds easy but I'm finding the logistics of it a bit tricky. Does it mean that I and my mistress always appear together in threads? Can she go off and do her own thing? Can I? Hmm ... inquiring minds want to know. If I'm really going to play my Kelvic IC, then I am not going to make him a self-sufficient character who is perfectly happy to go about his business without a master or mistress. In other words, he is unlikely to have much of an agenda apart from whatever agenda his master/mistress has.
The other side of the "successful Kelvic" question is the OOC side. And here is where I think it gets interesting. Let's face it, a character who does nothing but follow his mistress/master around all day might have a pretty limited range of play. Nobody wants to play a boring character and nobody wants to do collaborative story-telling with a boring character. So the player also has some goals (s)he wants to accomplish. Maybe I like physical conflict stories. Or maybe I like psychologial conflict stories. Or maybe I don't like stories with conflict in them (if there's no conflict, is it still a story?). The trick is to figure out how to align these OOC goals with the IC goals. If they don't align, I won't have a consistent character. Nobody expects a Rat Kelvic to wax eloquent on deep theological issues. That would introduce a glaring incongruity into the story which will break the suspension of disbelief and as we all know, you don't want to put things into a story that break the suspension of disbelief.
So, what is "a successful Kelvic"? It's one that is completely believable from an IC point of view and is satisfying to play from an OOC point of view. Of course that true for every race. I Just think it's especially difficult to do with a Kelvic.