I bought the re2 remake during the steam sale, but I haven't booted it up yet. I would say once graphics we're good enough, maybe beginning with Code Veronica, they did a pretty good job of making the characters stay consistent. The REmake, RE0, RE4, the Chronicles rail shooters on Wii, maybe I'm forgetting something.
Then Chris hulked out in 5 and characters started looking different come re6 and on. Maybe with the upgrade in tech they're based on actual actors doing mocap and they want the extra detail? I dunno.