"Kirby’s Dream Land was developed by Masahiro Sakurai of HAL Laboratory. Kirby was a dummy character that the developers used until they could define a more sophisticated image. The designers grew to like Kirby so much that they decided to keep him instead of using a more advanced character. He was originally named Popopo (ポポポ?), and Kirby’s Dream Land was titled Twinkle Popo (ティンクル・ポポ?). Eventually, he was renamed Kirby and the game was renamed Kirby of the Stars. During the development of what was then referred to as Twinkle Popopo, Popopo/Kirby’s colour had not been decided upon. Masahiro Sakurai wanted him to be pink, while Shigeru Miyamoto felt that he should be yellow. Eventually, Nintendo decided to make him pink. Although pink is still Kirby’s main colour, later games have shown Kirby in a wide variety of colours, including yellow.
When Kirby of the Stars was first released in Japan, it featured Kirby in pinkscale. However, Nintendo of America designed the North American box art and advertisements with a white Kirby based on the game’s grey-scale visuals.”