Keaton thought about everything with his characterization, including the now famous gravelly Batman voice.
“He’s got two personalities.
The guy is not psychotic but not far from it.

Michael Keaton as Batman.Warner Bros/Dc Comics/Kobal/Shutterstock
Controlled psychosis,“Keaton toldEmpiremagazinein a new Q&A.
“How do you justify the voice?”
So the voice came out of that, it was a really practical thing.”
And the rest is history.
Of course,Batmanwas a big hit and Keaton and Burton teamed up again for 1992’s superiorBatman Returns.
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