With motivation, I suppose.
In America, yes. It’s very rare. A judgement notwithstanding the verdict.
Yes, they can, As @JLeslie says, it is rare. Usually it happens when the judge feels the jury has not properly weighed the evidence.
In a criminal trial, they cannot find the defendant guilty over the jury verdict. In a civil trial, they can reduce the penalty/ damages to $1.
In criminal trial, the judge may only throw out guilty verdicts. He cannot overrule a not guilty verdict and declare the defendant guilty.
Judgement notwithstanding verdict
@luigirovatti: Criminal and civil trials are different. You didn’t specify.
@jca2: That’s because I want to know all cases, of course.
You can Google it and read all about it.
Yes.