Lollikittie wrote...
Aoki Daisuke, from Kodomo No Jikan.
Ignoring the implications of the genre,
He's an extremely compassionate, genuinely concerned person. He goes out of his way to ensure his students aren't suffering in silence. If he has the slightest reason to believe someone is in trouble, he does everything in his power to ensure their safety and wellbeing. He cares about what they want, and what they need. Most importantly... he doesn't stifle Rin's voice. Kids are often programmed to yield to the adults in their lives... handing over any and all free thought. He listens. He really.. really listens.
Totally forgot about his existence when writing about best character in another thread. I agree with Lolli about him.