Goku gains levels of Super Saiyan. In Bleach, Ichigo can activate his Bankai and Hollowfication. One Piece is full of strong characters, some of whom are lethal with a sword. In One Piece, Luffy ...

Transformation has been at the center of the Dragon Ball franchise for a very long time now. Stretching all the way back to the early days of the series, people were transforming all the time.