In pursuit of his art, Paul Dano wrapped his head in Saran wrap last year. This was not, it turned out, the healthiest idea. Dano was meticulously crafting his character for The Batman, the Riddler, envisioned by director Matt Reeves as a buttoned-down accountant by day, madman genius by night. The actor had carefully helped select a U.S. Army winter combat mask that costume designer Jacqueline Durran found on eBay, which Dano liked for its homegrown vigilante aesthetic, and he was thinking about the Riddlerâs fastidiously executed murders. âThe thoroughness of this person, the almost maniacal detail that he puts into plotting â I was like, âOK, well, should I just shave all my body hair?ââ Dano says. âSo thereâs no evidence?â He nixed that plan and decided instead, âIâmâŚ