Kuja has a tail that sprouts from him only when he shows his true form which is his Trance form. He's like Stitch from Lilo and Stitch in that Stitch's extra arms and antenna don't appear unless he shows his true form.
Wtf are you talking about? Firstly the trance form is not a person's "true" form. Secondly the tail is simply hidden by Kuja's clothing.