Bill Finger
Finger is essential to Batman's actual story language: detective structure, Gotham atmosphere, Robin, Joker, Catwoman, Two-Face and the strange urban logic that makes Batman more than a costume. His selection is the root of the mythology readers later meet in modern forms.
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Finger-linked omnibus editions are archive reading with real consequence. They explain where Batman's world becomes recognizable, from crime mood to supporting cast and recurring villains.