Oswald (KoF), a KoF-style original character named Gustav Munchausen, a certain Meiling clone named Hei Meiling (written "黑魅霊", "魅霊" is pronounced almost the same as "美鈴" in Mandarin Chinese.), a certain Alice clone named Physalis and a clone of Duo Lon named Psyqhical.

So except Oswald, the rest are fan-made characters.

not a playable character, but Gustav is an official character of KoF.