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During the a match do the following to have diffen form of Ryu at your disposal. (Level 1 super meter is needed.)

Evil Ryu: Half-circle back Fierce Punch
Ryu as Ken: Half-circle back Medium Punch
Turn Back: Half-circle back Quick Punch

To obtain the helper of you choice, you must always hold down start and then the designated buttons, just before selecting your second character.

Shadow
WP+MK+FP

Sentinel
MP+MK+FP

Storm
LP+LK+HP
She can be used up to 6 times.

Thor
LK+MP
He can be used up to 8 times.

Unknown Soldier
LP
He can be used up to 4 times.

Pure and Fur
LK
She can be used 5 times.

Anita
LP+MP+HP
She can be used 5 times.

Lou
MP
He can be used 8 times.

Rogue
LP+MP+HP+LK
She can be used 7 times.

Colossus
LP+MP+MK
He can be used 5 times.

Michelle Heart
LP+LK
She can be used 6 times.

King Arthur
LP+MP
He can be used 8 times.

Saki
HP
She can be used 7 times.

Ton-Pooh
LP+HP
She can be used 9 times

Iceman
MP+MK
He can be used 4 times.

Cyclops
LP+LK+MP

Magneto
LK+HP
He can be used 7 times

U.S. Agent
MK+HP
He can be used 5 times.

Psylock
MK
She can be used 5 times.

Devilot
MP+HP
Can be used 5 times.

Juggernaut
LP+MK
He can be used 3 times

Sentinel Attack (small form): Any Attack.
Dashing Attack (small form): Down, Down/Forward, Forward + any Kick.
Magnetic Tempest (small form): Down, Down/Forward, Forward + any Punch.
Unblockable Prison (small form): Forward, Down, Down/Forward + any Punch.
Teleport (small form): Down, Down/Back, Back + any Kick.
Magnetic Shockwave (small form): Down, Down/Forward, Forward + 2 Kicks.
Mega Optic Blast (small form): Down, Down/Forward, Forward + 2 Punches.
Hand Crush (large form): Any Punch.
Sentinel Attack (large form): Any Kick.
Hand Drill (large form): Down, Down/Forward, Forward + any Kick (when on the ground).
Laser (large form): Down, Down/Forward, Forward + any Punch.
Unblockable Prison (large form): Forward, Down, Down/Forward + any Punch.
Move (large form): Rather than going forward and back like in his small form, he now can go up and down in the air.
Laser beam (large form): Down, Down/Forward, Forward + 2 Punches (same as the ordinary laser, but he fires five of them).

If you can beat any of the secret characters and save the data into your VMS, you can use that character without reentering the code.

Choose Zangief. Do a 1/2 circle back, quick kick, and he will flash and turn into his evil form.