This is just a small idea: what is the first striking instance of pink (the color) you remember in a game?
Compared to other colors, it may be that you encountered pink later than the red, blues, greens and other colors in early arcade games. Or maybe you have a really good memory of something others would overlook. Think of this as a gut check rather than demanding accuracy: I say “first pink you remember playing,” and you say: “[ ].” Then later you can go, “Oh yeah, [ ] was earlier and had pink.”
Even though Kirby’s Dream Land is one of the first games I ever played, he’s white in that game. And it’s in black and white on the gameboy pocket anyway.
Kirby Superstar stands out as the most pink game of my childhood
Definitely Kirby in smash64 for me. However, my color vision isn’t so good and I sometimes confuse pink for gray and sometimes a teal. So I could have seen a pink before then without realizing it was pink.