These Codes work for all characters:

Infinite Batteries:
300D2911 00FF

Infinite Coins:
300D2912 00FF

Infinite Small Jewel:
300D291B 00FF

Infinite Big Jewel:
300D291C 00FF

Batman's Codes:

Turn On All Batman Codes:
50000A02 0000
800CF518 6363

Infinite Health:
800CF506 0064
8009AB78 0000
8009AB7A 0000

Infinite Health Batmobile:
801E312E 00FA
800D0710 00FA

Maximum Strength:
300CF4FF 0096

Maximum Speed:
300CF500 0096

Maximum Agility:
300CF501 0096

Infinite Stamina:
300CF4FC 0096

Infinite Cell Power:
800CF504 0168

Infinite Boost:
800CF502 0006

Have All Tools:
800CF50A 0F0F
800CF50C FFFF

Have All Weapons:
800CF508 FFFF

Infinite Bat Bombs:
300CF518 0063

Infinite Magnesium Bombs:
300CF519 0063

Infinite Tear Gas Bombs:
300CF51A 0063

Infinite Aerial Attack Missiles:
300CF51B 0063

Infinite Polar Assault Missiles:
300CF51C 0063

Infinite Vine Slicing Weapons:
300CF51D 0063

Infinite Opti-scope Missiles:
300CF51E 0063

Infinite Heaters:
300CF51F 0063

Infinite Batarangs:
300CF520 0063

Infinite Bat Taser:
300CF521 0063

Infinite Throwing Birds:
300CF522 0063

Infinite Staff Launcher:
300CF523 0063

Infinite Bat Net Gun:
300CF524 0063

Infinite Battle Blade Blaster:
300CF525 0063

Infinite Turbo Jet Lift Jetboots:
300CF526 0063

Infinite Bat Laser:
300CF527 0063

Infinite Cameras:
300CF52B 0063

Robin's Codes:

Turn On All Robin Codes:
50000A02 0000
800CF5D8 6363

Infinite Health:
800CF5C6 0064
8009AB78 0000
8009AB7A 0000

Infinite Health Redbird:
801E312E 00FA
800D0710 00FA

Maximum Strength:
300CF45BE 0096

Maximum Speed:
300CF5C0 0096

Maximum Agility:
300CF5C1 0096

Infinite Stamina:
300CF5BC 0096

Infinite Cell Power:
800CF5C4 0168

Infinite Boost:
800CF5C2 0006

Have All Tools:
800CF5CA 0F0F
800CF5CC FFFF

Have All Weapons:
800CF5C8 FFFF

Infinite Bat Bombs:
300CF5D8 0063

Infinite Magnesium Bombs:
300CF5D9 0063

Infinite Tear Gas Bombs:
300CF5DA 0063

Infinite Aerial Attack Missiles:
300CF5DB 0063

Infinite Polar Assault Missiles:
300CF5DC 0063

Infinite Vine Slicing Weapons:
300CF5DD 0063

Infinite Opti-scope Missiles:
300CF5DE 0063

Infinite Heaters:
300CF5DF 0063

Infinite Batarangs:
300CF5E0 0063

Infinite Bat Taser:
300CF5E1 0063

Infinite Throwing Birds:
300CF5E2 0063

Infinite Staff Launcher:
300CF5E3 0063

Infinite Bat Net Gun:
300CF5E4 0063

Infinite Battle Blade Blaster:
300CF5E5 0063

Infinite Turbo Jet Lift Jetboots:
300CF5E6 0063

Infinite Bat Laser:
300CF5E7 0063

Infinite Cameras:
300CF5EB 0063

BatGirl:

Turn On All Codes:
50000A02 0000
800CF578 6363

Infinite Health:
800CF566 0064
8009AB78 0000
8009AB7A 0000

Infinite Health Redbird:
801E312E 00FA
800D0710 00FA

Maximum Strength:
300CF55F 0096

Maximum Speed:
300CF560 0096

Maximum Agility:
300CF561 0096

Infinite Stamina:
300CF55C 0096

Infinite Cell Power:
800CF564 0168

Infinite Boost:
800CF562 0006

Have All Tools:
800CF56A 0F0F
800CF56C FFFF

Have All Weapons:
800CF568 FFFF

Infinite Bat Bombs:
300CF578 0063

Infinite Magnesium Bombs:
300CF579 0063

Infinite Tear Gas Bombs:
300CF57A 0063

Infinite Aerial Attack Missiles:
300CF57B 0063

Infinite Polar Assault Missiles:
300CF57C 0063

Infinite Vine Slicing Weapons:
300CF57D 0063

Infinite Opti-scope Missiles:
300CF57E 0063

Infinite Heaters:
300CF57F 0063

Infinite Batarangs:
300CF580 0063

Infinite Bat Taser:
300CF581 0063

Infinite Throwing Birds:
300CF582 0063

Infinite Staff Launcher:
300CF583 0063

Infinite Bat Net Gun:
300CF584 0063

Infinite Battle Blade Blaster:
300CF585 0063

Infinite Turbo Jet Lift Jetboots:
300CF586 0063

Infinite Bat Laser:
300CF587 0063

Infinite Cameras:
300CF58B 0063