Batman seems like a potentially plausible reality in the future, factoring in a fuck ton of money AND the Batcomputer, one of the most underrated aspects pf the character. Assuming he’s working with next gen tech on the computer you could plausibly consider that the Batcomputer has some incredible AI capabilities that could give his normal power set to a real world person (to a degree). It could make plans, develop new bat gadgets, research, create work out and training regiments, etc etc. Wouldn’t fit for OP’s question but someone could eventually become somewhat of a Batman in the future with enough drive and money.