The following are known CWCheat Codes for Prinny: Can I Really Be the Hero? on Sony Playstation Portable (PSP).

_S ULES-01278
_G Prinny: Can I Really Be the Hero? [EU]
_C0 Freeze Time
_L 0x20046768 0x00C02823
_C0 Infinite Air-Jumping
_L 0x20081738 0x24630000 
_C0 Infinite Air-Jumping (Alt.)
_L 0x00367CE8 0x00000000
_C0 Infinite Scarves
_L 0x00367D00 0x00000004
_C0 Invulnerable
_L 0x00367C60 0x000000DC 
_C0 Lives Remaining
_L 0x1018D942 0x000003E8
_C0 One-Hit Kill
_L 0x2006F5EC 0xAE400120