Scary then light. Over-zealously seek your character's goal. Then TONE IT DOWN to conversational level. One way to play comedy is as a perverse pleasure. Pauline Kael once said that Steve Martin performed as if he was being electrocuted and getting a kinky pleasure from it.
Characters try to conceal their real feelings, including from themselves.
Start with one, like anger. As you recognize some that don't fit that emotion, label what it is instead. Once with fear, once angry, once happy. Macho, embarrassed, surprised, eager, awe, warm, loving, routine, realization, defensive, determined. Experiment with how that character would laugh, cry, moan and whimper, maybe trying to find one that sounds funny.