Ok, so if Beatrix counts, then definitely she is my number one.
Other than that, I also enjoyed Fratley, Mikoto and the Black mages who raise Bobby Corwen.
I liked Tantalus in general, especially Baku and I love the cutscene entitled "Do as I say, not as I do". Isn't that the one where he sneezes a lot? An then I also liked Cid as a frog (not as an oglop) and Hilda.