Is Punisher a good guy

Yes. the punisher is a good guy. The adult-comic book ( sometimes called Graphic Novels) character goes about in costume using all manner of weapons and taking the law in his own hands- Saint Paul warns us: recompense ( re-compensation, pay bacK) to NO MAN, Evil for Evil! in other Words, two wrongs do not make a right. If a murder suspect is found guilty and executed by Capital Punishment, that is within the legal protocols- Lynching and vest-pocket assasination is out of the question. N"uff said, as Sergeant Fury would sign off.

if he fight criminals And save People. so he is superhero.

The Punisher is not an Anti-Hero anymore and he is definitely a good guy and a hero