Vanguard Princess was almost fully developed by Tomoaki Sugeno (or Suge9), an ex-Capcom programmer and sprite designer who worked in games like Resident Evil 3: Nemesis and made character sprites for The King of Fighters EX: Neo Blood. Suge9 uses Fighter Maker 2nd for his work, a popular graphic engine for Windows by ASCII which was already used for make fighting games like Super Cosplay War Ultra, Magical Chaser ~Stardust of Dreams~, Arm Joe, Crimsom Alive or Destruction Desire. Suge9 programmed, illustrated and designed the game by himself, but the music was taken from "nash music library", a GNU library of songs. Suge9 also resorted to seiyuus for recording the voices for all the characters.