Activate "In-battle" cheats
To enable the "in battle" cheats during a fight hold down the Target button then press on the directional pad: R, R, L, L, R, L, R after hearing the tone enter the codes for different cheats.

Baby Players (In-battle)
During a fight enable the “in battle cheats” then press WP, SP, SK, WK, Target

Bunny Despair
At the main menu press R, R, L, L, R, L, R. A tone should then sound. Then, to clothe the daemon in a cute bunny suite press: C-left, C-up, C-right, C-down.
Character moves not in the manual
NOTE: all kick and punch buttons are based on the standard settings:

Xena
Flying kick: away, towards + SK

Caesar
Archers: away, towards + WP

Ephiny
Super Cartwheel: away, towards + sk

Callisto
Round house: away, towards + SK

Velasca
Super Blow: SP+SK

Autolycus
Drop Kick: away, towards + FK

Ares
Ring of Fire: SP + SK

Despair
Heat seaking fire snake: away, towards + FP&FK
Boulder toss: away, towards + QP
Deamon Breath: away, towards + FP
Blender: When crouched hit the FK button twice. If both slices connect it takes away almost half an opponents energy.

Invisibilty (In-battle)
During a fight enable the “in battle cheats” then press SK, SK, SK, WK, crouch

Play as Despair
At the main menu press R, R, L, L, R, L, R. A tone should then sound. Now to access the final boss press C-left, C-right, C-left, C-right.

Snow Fighters (In-Battle)
This puts the textured characters into their polygonal form. During a fight enable the “in battle cheats” then press SP, SP, Target

Titan Quest mode
At the main menu press R, R, L, L, R, L, R. A tone should then sound. Then, to try this insanely hard mode press: C-up, C-down, C-up, C-down

Xena vs. Gabrielle
At the main menu press R, R, L, L, R, L, R. A tone should then sound. Then, to be able to have Xena fight Gabrielle instead of Hope press: C-left four times.