[Rune Son of Bjarne]

Beorn - “Forceful” might be more accurate, but he certainly have bundles of energy, and is an entry that cannot be ignored.
Gondor – No Gondor was a stagnant culture, even in its youth it was merely a remnant of a glorious past. Now Numenor you could argue, had been an energetic (and innovative) society, but Gondor always seemed to be looking to the past, remembering what once was.
Butterbur- Definitely a contender, though “stressed” would be more accurate.
Thorin – Also a possibility, he definitely had his moments, he probably wasn’t special amongst dwarves, but he certainly was passionate about retrieving his stolen treasure.
Wargs – No, not really. They just seem wolfish.
Beregond – Yes in a way, again maybe “passionate” would be better, but he does display some qualities that might be described as energetic.
Mayor Moneybags - No
Sauron – I can see why some might pick him in this category, but personally I would never use that word to describe him.
Bill Ferny - No
Varda – I really have no opinion about this one

I did not actually forget about this, I just didn't really have time to sit down and have a proper look until now.