What I wouldn't give to use the callsign "Triple Charlie"
Someone from ATC correct me if I am wrong but I don't beleive you can use your callsign in that manner.
I recall listening to an exchange many years ago between Perth ATC and a certain pilot who used to frequent these pages. The aircraft had a three identical letter callsign and he was told over the radio that the "triple *" was no longer acceptable. A brief argument ensued but he wasn't going to win that one on the spot.
Maybe the rule has been changed since?