Sometimes, Miles Vorkosigan. Very short, hyperactive, doesn't know the meaning of "impossible", charm on overdrive, and if not handsome exactly, manages to attract various tall, beautiful women through sheer personal magnetism. He does have troughs that match the peaks, unfortunately for him.
Nahruahn from The Quest of the Unaligned fits this trope perfectly from the moment he appears, in which he delivers an eleven-line speech in a single sentence (and breath). All ruahks act like this to a degree.