Blanc/White Heart's color design is that of the original Famicom, Noire/Black Heart is reflective of the PlayStation 2 and original PlayStation and Vert/Green Heart matches the original Xbox.
Plutia/Iris Heart is a parody of the Sega Megadrive (known as the Genesis in North America) while her name derives from another unreleased prototype by Sega known as the Pluto.
Yellow Heart is based on the TurboGrafx-16, known as the PC Engine outside North America. Likewise her alter-ego, Peashy, is based on Hudson Soft, (known for the bumble bee in their logo complimenting her bee striped outfit) who co-developed the console.