Jocelyn "Joss" Possible
Voiced by: Tara Strong
Joss is Kim's Cousin on her father's side and daughter to "Slim" Possible, she made only a single in person appearance in the show, but is notable within the franchise in that she is the only character other than Kim's mom who has been specifically confirmed as a Possible whose name is not a take on the word "Impossible" (It was never stated whether Cousin Larry was a Possible). Joss is obsessed with Kim.