Although I'm thinking that if you get a guy with the seemingly unlimited resources of a Bruce Wayne, train him to peak levels of fitness and combat, give him high-tech bodyarmor and practical "toys", I suppose you could have a real-world equivalent of a Batman.
Bolding mine.
Firstly, I have to point out that a thread specifically created for debating the equipment needed for engaging in Punisher / Batman-type activities is better suited than here.
Secondly, the eighties Punisher comics (to the best of my memory) stated explicitly that he took what he wanted from the criminals he took down. If you whack enough mobsters then you will never have to worry about ammo, money or grenades ever again. The guys in New York 'families' who were arrested by the FBI had arsenals worthy of a military cache.
Body armor isn't prohibitively expensive, and most of the equipment seen in Punisher (idiotic storylines about 'spirit guns' and angels aside) is tech which is available now.
ANY marine or SAS member would be able to carry out the assaults which the character is best known for.
Side-point. The shuriken (batarangs) used by Batman wouldn't work. That isn't what ninjas traditionally used them for (ie hurting combatants), and in most texts on traditional fighting styles
they are only a diversionary tool. A ninja would throw a "throwing star", which could be any shape they needed, at a wall to get a guard to look in that direction then perform a silent kill from behind.
It's a case of
popular belief assuming media representations, and not really a good trope at that. Batman's car
is cool, though (though the lateral stress of throwing out a grappling hook to latch a streetlamp at speed would make a mess in reality).
I wrote a massive list of the tools one would need to assume a vigilante role. I'll pull it out of the drawer and take another look at it and, if the contents still hold up, I'll post some of the equipment needed.