That sounds like a good idea...But it also sounds a lot like the two mail-driven sections that Brian has up for 8-Bit Theater...The one for Red Mage (I think it's called Twink mail or something) and the one for Evil Princess Sara...Although I haven't been to Nuklear Power for a while, so I dunno if they still even have those sections...Sounds cool...But sounds like 2/1 odds that most of the letters are going to be to Magus...But whatever...I've got a great response from him, "There's a letter here...Shall we burn it?"
Maybe some mail should be responded to by multiple "personalities" even.