User blog comment:Mythril Wyrm/Characters' heights/@comment-68.119.192.94-20171006160459/@comment-6608822-20171006192141

Jacqui Ainsley, who provided the motion capture for Madison Paige, is 5'9" (http://articlebio.com/jacqui-ainsley). I think it's safe to assume that the characters are the same heights as the actors and actresses who portray them unless the developers of Heavy Rain, in-game documentation, or other official sources say otherwise.