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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Batman has one:

HERO: Batman, for one
CAPE: Batman has one
BOYWONDER: Batman's Robin, for one
DUO: Batman and Robin, for one
DUO: Batman and Robin are a "dynamic" one
DUO: Batman and Robin were a dynamic one