Cold and stoic characters run rampant in anime, whether they be completely apathetic to everyone and everything else or cold enough that they never say anything kind to others. Or get really, frighteningly angry. Or they're just...icy.
My favorite stoic/cold character is going to have to be Hatori from Furuba. He's cold/stoic and appears to not care about his friends and family, but he serves as the family physician and is just generally kind through his actions instead of his words.
Who's your favorite and why?