Well, actually you can all be right. Captain falcon is the face of the smash bros fan base bringing hype into the game. However, that can't be relied on as it was Link who basically made everyone start hating tier list.
I think that there are four faces of Smash bros. We talk about intros and stuff but I'm going to say every game.
In the first game there was no one as the game concept is new to everyone. In melee, mario, link , Pikachu, and Kirby are the faces. Look at it they start and end me lee's over the top intro. Represent brawls changes from mêlée in a video and literally take up 4 ' s intro