Well actually in a Role Playing Game you do play a character, why its called role playing. Its you in the sense that you make decisions, though in a a real role playing game like Dungeons and Dragons, out comes are determined by rolling dice rather than being predetermined by computer programmers.
None of my characters in the Darkside games I've been switching between have dialogue except SWTOR and having played that game for so long its jarring in other games to have cut scenes in which the NPCs talk but my character just stands there.
Adventure Game: Broken Age
Darkside: Star Wars: The Old Republic