There's a supporting character in my story which I'm having trouble portraying the way I want. He's a sort of clown in his world, and I want him to have a very silly personality. He wears it like a mask, to keep most people from keeping him seriously. At the same time, he can't just brush off the serious situations which he is put in. I'm not sure how to give him this appearance of acting ridiculous, without going overboard. Does anyone have suggestions?