>>280857840Despite Batman secretly being Bruce Wayne not actually being that obvious from an in-universe perspective (since why would someone assume that the very public super rich playboy is secretly spending his nights being a ninja fighting supervillains in the streets), I do think there will be some line of reasoning that makes Kira suspect Bruce Waryne. Simply from the meta pov that in this hypothetical storyline, it would be a way to increase the tension if Batman is being hunted by Kira while hunting Kira. In the same manner that there would probably be some line of thought that leads Batman to suspect Kira of being L.
I also think it depends on which batman is being used in the matchup, namely if it's a batman that is already aware of the existence of the supernatural.
>>280858078It's only easy because we've had decades of batman stories, and gotham stories pretty much only focus on bruce wayne. Depends on the continuity, but I remember there was an old storyline in which the Riddler was trying to figure out who was Batman, and there were like dozens of hyper rich men who had been struck by tragedy thanks to crime, since if there's two things that Gothem isn't short on, it's money and crime.