Now, I know Maou is the drama that pretty much launched Ohno's TV drama career, but the really outstanding one in that show - for me - was Toma.
Really, Toma has to be one of the best actors in Johnny's. I would venture that he might be one of the best out there in the J-drama scene at the moment.
The guy does it all so brilliantly - wacky and silly (HanaKimi, Unubore Deka), bad guy (HanaDan), earnest (Honey & Clover, Majo Saiban), tragic and desperate (Maou), melancholic romantic lead (Hanamizuki), and outright frightening (Nou Otoko). I attempted to watch Nou Otoko on a long-haul flight a couple of months ago but barely got through a third of it because it was just too creepy for my taste and man, was Toma intense. @_@
Sorry, Jun, Okada, Nagase. I think Toma blows you all right out of the water. (Though you three are pretty amazing too! Nagase, especially.)