Does using a 100% save break the game? A: No – BT3 doesn’t lock you out of anything. You can still replay story mode, tournaments, etc.
If you don't want to download a full file but want specific high-level characters, you can enter passwords in the from the main menu. Red Potara Password Goku (Early) S+2wR ffGkp F2R96 Y! cQ*x2 K! 0pC $NQXM $2 Majin Vegeta h5mQ7 94BKd lGZhW nd kRbC$ (y%pJ 7c4T% Wv SSJ4 Vegeta 3Njf# Sn&W* WM+jy Wj +X-5+ CJH+4 Nby-3 0M Future Gohan zKtY@ 5dn#5 0%x6b Vy Vf(8c chX?? fWq+k KQ dragon ball budokai tenkaichi 3 save data ps2