Street Fighter Zero 3

Unlock Super Akuma:
Go to the fighter selection menu and highlight Akuma, then
hold start and hit A.

Unlock Super Vega:
Choose training, arcade or VS mode. Go to the fighter selection
menu and highlight Vega, then hold Start and hit A.

Unlock Super Gouki:
Go to the fighter selection menu and highlight Gouki.
After hold Start and hit A.

Tougher World Tour:
Reach at least 3,000,000 points in WorldTour mode. Defeat in the final
battle Juli/Juni and Shin Vega. If you win you will get to GOKUENTOU
island. Beat the toughest opponent.

Play as EX-Vega (Shin-Bison):
Complete the game with a World Tour character that you have entered
into the game. Then finish arcade mode with a difficulty of 8,
without using a single continue. If you done, you can play as
EX-Vega in VS, arcade and in training mode. To select him,
highlight Vega at the fighter selection screen and hold on
to start and any button.