[Loslote]

Beorn - Maybe. I'd say more driven and motivated than energetic, but that might just be semantics.
Gondor - I'd say Gondor is the opposite of energetic, looking at its conduct without a king.
Butterbur - Far too forgetful to be the best choice, to my mind.
Thorin - Gold-hungry, ambitious, mighty, yes, but energetic? Mmm, maybe...
Wargs - Now this is a choice I can get behind.
Beregond - Yes, I'd say he fits the description.
Mayor Moneybags - A humorous choice if anything.
Sauron - Hmm. In more ways than one - a firey eye would consume a lot of energy, let along the energetic nature Sauron has as a character.
Bill Ferny - A different sort of energy than we've mostly seen, but energetic nonetheless, I'd say.
Varda - As Queen of the Valar, I see her more as an elegant, beautiful figure than an energetic one.