Guru Pathik 
Seriously, I can't believe I didn't think of this one sooner! I absolutely loved this episode in Avatar: the Last Airbender, especially when Aang's daydreams really getting crazy. (If anything, that provides a pretty good example about what happens to you when you don't get enough sleep.) I also like this character...to me, Guru Pathik was just made of awesome.
Hope y'all like it. Later! ^_^
