The unlock system in King of Fighters Wing 1.9 functions on a "cumulative points" basis. Unlike RPGs where specific tasks unlock specific items, this game requires the player to accumulate a total score (Points) across all game modes.
I can provide a more specific button combo for that version. Share public link King Of Fighters Wing 1.9 All Characters Unlock
Now, every character—including Maki and Evil Ash—will be permanently unlocked, even after you close the game. This method does not require winning a single fight. The unlock system in King of Fighters Wing 1
KOF Wing 2019 includes: