This is actually an ongoing plot in the current run. In an altered state of consciousness, Batman created a failsafe, literally called Failsafe, to kill himself if he ever killed someone else.
When the program sees an article that he killed someone (he didn’t, it was a setup), it releases the robot Failsafe to defeat him. Batman has yet to defeat Failsafe, though he has survived so far against it.
He either defeats Batman or pulls him over to his side. Usually by invoking their parents.
They're was a run where he's fighting an alternate universe Batman who is actually Thomas Wayne, from a universe where Bruce is the one that gets killed and Martha becomes the joker.
All of them. The exception would maybe be something like Failsafe, which is a robot built by Batman (in an altered state of consciousness) to defeat himself if he ever killed someone. So, Batman is really the only one who could defeat Batman.
Oliver Twist. Anne of Green Gables. The Hunchback of Notre Dame. Stuart Little.
All the characters in Charlotte's web.
Bambi. Bambi's mother.
Now, I'm one of those "with enough time and prep, he could beat anyone" kinda guys, BUT, there is one near godly being that I think could take Batman:
Bugs Motherfucking Bunny.
Yknow, Kirby comes up in these power scaling conversations a lot, but I've never seen Batman vs Kirby before.
My gut instinct is that Kirby could defeat Batman, but it wouldn't happen, because Batman would quickly figure out that he can get Kirby to do anything by dangling a lollipop in front of him.
I'd love if a Batman fan had a more nuanced take, though. I only know The Animated Series and it's not exactly fresh in my mind.
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