1-Up in the 20X6 universe of Homestar Runner. This also applies a little bit to present-day counterpart Homestar Runner himself, although he is more of a Cloud Cuckoolander and most any behavior he exhibits that falls under this trope is as a result of it.
As convention-goers can attest to, Doug Walker is a smiley, bouncy, hyper flirt who likes his glomps. His character also descends into grins a mile wide, running around excited and super-sonic squee when he's enjoying himself.
Especially his crossover with Sad Panda, Masoko X, Welshy and Mike J. He starts laughing hysterically and can't stop for over five minutes. In the end they have him cover his eyes and pretend he's crying so they can keep filming.
Lewis Lovhaug is apparently this in Real Life, according to Spoony, who said that during the filming for Kickassia he still had energy for shooting videos after a day in the desert outside Reno, while Spoony himself was wiped out.
Every Angry Joe Show is a continous 20 minutes adrenaline rush. His personal favorite games are dancing games.
While a bit older than most examples, JewWario is pretty excitable and definitely isn't above doing fanservice either.