Spawn - In The Demon's Hand

Unlock character galleries
Finish the tournament battle with any character to unlock
their gallery.

Unlock hidden characters
Finish boss attack in arcade mode with any character

Powered-up characters:
When you character has almost maximum health, press R + B or X + A + B
to change to alternate powered-up form.
Press R + B or X + A + B again to back to normal mode.

Character endings:
Play arcade boss mode in multi-player on the hardest difficulty mode.

Unlock Black Brimstone:
Beat the game in Boss mode with every character. You do not have to finish
the tournament mode. Highlight Brimstone in any mode, after hold L + R,
and push A.

Beat the indicated Boss modes in multi-player mode
to unlock additioanl characters:

Unlock Dark Ages Spawn: Beat Boss mode with CPU Asout continuing 5 times.
Unlock Admonisher: Beat Boss mode with CPU Asout continuing 14 times.
Unlock Spawn I: Beat Boss mode with CPU Asout continuing 1 time.
Unlock Spawn IV: Beat Boss mode with CPU Asout continuing 10 times.

Beat the indicated Boss modes in single player mode with
the indicated character to unlock additioanl characters:

Zombie I:Beat Boss mode with Gatekeeper.
Wolf I: Beat Boss mode with Cy-Gor.
Vindicator: Beat Boss mode with Clown.
Vaporizer: Beat Boss mode with Vandalizer.
Vandalizer: Beat Boss mode with Cogliostro.
Vacillator: Beat Boss mode with Vindicator.
The Mafia: Beat Boss mode with Sam.
The Curse: Beat Boss mode with Spawn.
Sub Curse: Beat Boss mode with The Curse.
Soleil: Beat Boss mode with Grace.
Soldier I: Beat Boss mode with Twitch.
Skeleton I: Beat Boss mode with Al Simmons .
Overtkill: Beat Boss attack mode with Brimstone.
Hell Spawn: Beat Boss mode with Redeemer.
Green Beret A: Beat Boss mode with Jessica.
Gatekeeper: Beat Boss mode with Hell Spawn.
Cy-Gor: Beat Boss mode with Tremor.
Army A:Beat Boss mode with Overtkill.
Angels E: Beat Boss mode with Tiffany.
Angel Teneres: Beat Boss mode with Soleil.