You can use a save file or unlock code (common in Flash game versions):
For Flashpoint or older browsers:
Most secret characters in version 1.9 are unlocked by completing the game's Arcade Mode or using specific cursor tricks on the character select screen. King Of Fighters Wing 1.9 All Characters Unlock
If you're having trouble unlocking a specific character, let me know: Are you playing or 1.91 ? Which character are you currently struggling to unlock ? You can use a save file or unlock
Many characters in KOF Wing 1.9 feature a "Second Mode" that alters their move set to reflect different eras of the series: Ash Crimson : Can switch to Iori Yagami : Can switch to : Features variants based on his appearances. move sets and special combos for any of these unlocked secret characters? Many characters in KOF Wing 1