Risking It All For Your Friend Drama Piece
In order to get the "Risking it all for a friend" drama piece, you must play the mission in Story Mode that involves Gohan fighting Nappa. Let Gohan get a little fatigued then start attacking Nappa until the point he uses his ultimate attack. Get hit by it and Piccolo will sacrifice his life for you. Beat Nappa to unlock and it can be used for all the characters.