I don't know if this is the right forum for this but...

[KillerBunny 0]

Is there any way to change the character you play in the campaign to the one in your profile?

Thanks.

[no use for a name 0]

nope. not unless someone makes a mod that replaces those characters; but then you'll just play the character of the guy who made the mod (not the one in your profile).

[Diosdemuerte 10]

I'm almost certain the answer is no. They have scripted voice acting in the game, and the character you play is in the scripting. There may be a way with a mod, using the setFace command for every mission... but I'm no scripter or moder, so I'm not sure if this can work.