Nitro Royale: Heroines Duel Cheats - PC

Unlock Characters
Anna - Beat Arcade mode five times
Henri - Beat Arcade mode twice
Ignis - Beat Arcade mode three times
Kaigen - Beat Arcade mode four times
Saya - Beat Arcade mode once
Another Blood - Beat Arcade mode six times
Saber - Beat Arcade mode twelve times

Unlock Ending CG
Once you have beaten the game with a character, their Ending CG can be viewed in the Extra Menu.

Unlock Character's Sound Test
By beating Arcade mode, you unlock the character's sound test which can be found the the Extra menu.