Vlad
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I like all of them at this level... except for the Royal Griffin... it doesn't look very good... it's as if it has a bucket on its head and no eye slits... after all, it's not a horse-griffin, so it shouldn't have blinkers...
Personally, I like Succubi in Heroes 5 (because they attack multiple targets).
And, of course, Vampires... because of their ability to regenerate.