What kind of personality would you say Mel Gibson has in the Lethal Weapon series?

Question

Like his sense of humor and things like that.

Answer 1

Self-destructive, high anxiety, manic.. all possibly due to trying to hide low self-esteem brought on by depression.

Or he could just be extremely ADD.

Answer 2

His character suffered with intense grief in the death of his beloved wife. The laughter in most of the movie is to cover for the pain. Grief has many steps: denial, bargaining, depression, acceptance, anger, all can repeat themselves until the person reconciles themselves to the death.