Rondo of Swords Cheats

Unlockable Characters
Aegil in Stage 17: Send Serdic to east door of the start point while Marie is alive
Alhambra in Stage 10: Go near the big boulder and talk with Serdic
Ansom in Stage 5: Talk to with anyone
Arios in Stage 13: Talk to with Elmer
Cotton in Stage 9: Clear the hidden Stage 9
Elmer in Stage 12: Talk to with Selmer
Garahad in Stage 21: Talk to with Igraine
Izuna in Stage 19: Talk to Yumiluna with Serdic in stage 18 and have Shino talk with Izuna
Owl in Stage 7: Talk to with Marie
Rukia in Stage 11: Talk to with Serdic
Shino in Stage 15: Talk to with Serdic while Marie is alive
Simon in Stage 18: Talk to with Marie or Serdic
Yumiluna in Stage 18: Talk to with Serdic

Unlock hidden stage 9
To unlock stage 9, you must not allow any of the townspeople in stage 8 to die.

Unlock Hidden Stage 18
To unlock Stage 18, you must open the prison door then have Serdic talk to Yumiluna.

New game mode
When you beat the game, you can start over again with some of your previous data such as items and money:

New Game +: Beat the game