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His rapid-fire dialogue, quick wit, and natural chemistry with co-stars established the tone of the Marvel Cinematic Universe (MCU). Downey often seemed to embody Tony Stark—delivering lines with such ease that it’s hard to imagine any other actor capturing that same energy and nuance. His unique blend of intelligence, humor, and vulnerability turned Iron Man from just a comic book hero into a cultural icon—a role that feels inseparable from the actor who brought it to life.