Following are the details but brief facts about The Punisher.
Why he chose to become the Punisher
When mobsters slew his family, Frank Castle vowed to spend the rest of his life avenging them. Now equipped with state-of-the-art weapons, he now wages a one-man war against crime as the Punisher. Castle used his combat experience, guerrilla warfare, urban warfare, using detective-like skills, always adapting to the enemy such as using the Mafia’s own methods and tactics against them and whatever resources and means may be necessary to do so.
Once they try to stop him
Wolverine, Daredevil and Spider-Man team up to finally deal with Castle. He was on a mission destroying the Irish mob when he was confronted by the trio of heroes. But he was able to taunt them enough to set them off against each other allowing him to escape. He continued his mission, but allowed the heroes to catch up and took Wolverine out using a rocket launcher, he trapped Spidey in a room full of explosives. Daredevil, however, got the upper hand and tackled him out a window. But he survived and warned Daredevil to leave him be. Spidey was freed when it was revealed the explosives were fake. Castle contacted Matt to arrange a meeting, but when they arrive they find the Hulk. He destroyed the building. He then convinced Daredevil and the other to leave him alone. He revealed that he had been feeding stew filled with plastic explosives that when detonated reverted him back to Banner.
The civil war act
Initially, Castle was not concerned about the civil war between the heroes until the government started using super-powered criminals to enforce the law. This act made Castle enter the war on the side of
Captain America and the Secret Avengers.
At one point, the Punisher was recruited by General Thaddeus Ross to be a part of his new Thunderbolts team alongside
Elektra, Deadpool, and Venom, but unfortunately he went rogue and started killing his fellow members, starting with the Leader, thus Frank returned to his life of an outlawed vigilant.
His extraordinary Powers
As the Punisher, he has no superhuman powers. Although, Nick Fury’s intel classified him as being power level 6 or greater due to his fighting skills, his weaponry and his use of lethal force.