User blog comment:Nightquest/Season 16 and future expectations/@comment-6345313-20120307075451

Kenny's unmuffled voice is a rare treat and each instance of it is special. I would hate to see it be devalued.

As for Karen, I'm sure she was used simply as a prop character in her initial appearance. I'd like to think that the studio got word of the fans taking notice of her and they gave her a role.

Kenny's parents are aware that Kenny gets resurrected often, though birth, and are often aware of his deaths as they occur. Whether they remember them is unclear.

He died permanently in "Kenny Dies" because he was intended to be written off of the show. Fans took issue of this and he returned.