L! L! L!
L is sleep deprived. He doesn't sleep, methinks. Comes with the too much sugar thing, and the whole superintelligent thing.
Actually, he's thought to have Asperger's Syndrome, I think.
As of now in the series, I think it's slightly unfair to judge who's the favourite, and we've only really SEEN L for one episode, while Light's had six. At the beginning of the MANGA I liked Light more than L, but over time, as it went on, I realised just how damn adorable L iiiiis!